Bicyclic prostaglandins and process for their preparation

ABSTRACT

Bicyclic Prostaglandins and pharmaceutical and veterinary compositions containing them, having numerous pharmaceutical and veterinary utilities, including for example hypotensive, vasodilatory, anti-aggregating, and anti-thrombotic activities. Methods for preparing the compounds and compositions are also disclosed.

This is a divisional application of Ser. No. 965,268, filed Dec. 1,1978, which is a rule 60 divisional application of Ser. No. 859,703,filed Dec. 12, 1977, now abandoned.

The present invention relates to 2-oxa-bicyclic prostaglandins, to amethod for their preparation and to pharmaceutical and veterinarycompositions containing them.

The compounds of the invention are 2-oxa-bicyclic prostaglandins offormula (I) ##STR1## wherein R is a member selected from the groupconsisting of (a) a free or esterified carboxy group; ##STR2## whereineach of the R' groups, which are the same or different, is C₁ -C₆ alkylor phenyl; (c) --CH₂ OH; ##STR3## wherein R_(a) and R_(b) areindependently selected from the group consisting of hydrogen, C₁ -C₆alkyl, C₂ -C₆ alkanoyl and phenyl; ##STR4## (f) --C.tbd.N; Z₁ ishydrogen or halogen;

p is zero or an integer of 1 to 7;

q is 1 or 2;

R₁ is hydrogen, hydroxy, C₁ -C₆ alkoxy, ar-C₁ -C₆ -alkoxy, acyloxy;

Y is a member selected from the group consisting of --CH₂ CH₂ --,--C.tbd.C--, ##STR5## wherein Z₂ is hydrogen or halogen; one of R₂ andR₅ is hydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ -C₆ alkynyl or aryl,and the other is hydroxy, C₁ -C₆ alkoxy, ar-C₁ -C₆ -alkoxy or R₂ and R₅,taken together, form an oxo group;

each of R₃ and R₄, which are the same or different, may be hydrogen, C₁-C₆ alkyl or fluorine or R₃ and R₄, taken together with the carbon atomto which they are linked, form the radical ##STR6## or the radical##STR7## each of n₁ and n₂, which are the same or different, is zero oran integer of 1 to 6;

X is a member selected from the group consisting of --O--, --S-- and--(CH₂)_(m) --, wherein m is zero or 1;

R₆ is a member selected from the group consisting of

(a') hydrogen;

(b') C₁ -C₄ alkyl;

(c') a C₃ -C₉ cycloaliphatic radical, unsubstituted or substituted byone or more substituents selected from the group consisting of C₁ -C₆alkyl and C₁ -C₆ alkoxy;

(d') aryl, unsubstituted or substituted by one or more substituentsselected from the group consisting of halogen, halo-C₁ -C₆ -alkyl, C₁-C₆ alkyl and C₁ -C₆ alkoxy; and

(e') a saturated or unsaturated heterocyclic ring, unsubstituted orsubstituted by one or more substituents selected from the groupconsisting of halogen, halo-C₁ -C₆ alkyl and C₁ -C₆ alkoxy.

Also the pharmaceutically or veterinarily acceptable salts as well asthe optical antipodes, i.e. the enantiomers, the racemic mixtures of theoptical antipodes, the geometric isomers and their mixtures and themixtures of the diastereoisomers of the compounds of formula (I) areincluded in the scope of the present invention.

In the formulae of this specification the broken line ( ) indicates thata substituent bound to the cyclopentane ring is in the α-configuration,i.e. below the plane of the ring, a substituent bound to the2-oxa-bicyclic system is in the endo-configuration and a substituentbound to a chain is in the S-configuration; the heavy solid line ( )indicates that a substituent bound to the cyclopentane ring is in theβ-configuration, i.e. above the plane of the ring, a substituent boundto the 2-oxa-bicyclic system is in the exo-configuration and asubstituent bound to a chain is in the R-configuration; the wavy lineattachment ( ) indicates that a substituent does not possess a definitestereochemical identity i.e. that a substituent bound to thecyclopentane ring may be both in the α- and in the β-configuration, asubstituent bound to the 2-oxa-byciclic system may be both in the endo-or in the exo-configuration and a substituent bound to a chain may beboth in the S- and in the R-configuration.

In the compounds of the above formula (I) the heterocyclic ring B iscis-fused with the cyclopentane ring A and the two bonds indicated bythe dotted lines ( . . . ) are both in the α-configuration with respectto the ring A.

The side chain β-linked to the cyclopentane ring A is intrans-configuration with respect to the α-fused heterocyclic ring B andconsequently it is an exo substituent with respect to the 2-oxa-bicyclicsystem.

The carbon atom of the heterocyclic ring B bearing the side chain##STR8## also bears hydrogen atom.

When the side chain ##STR9## is in the endo-configuration with respectto the 2-oxa-bicyclic system, then said hydrogen atom is anexo-substituent and its absolute configuration is reported as β whilewhen the chain ##STR10## is in the exo-configuration, then said hydrogenatom is an endo-substituent and its absolute configuration is reportedas α.

The compounds of the invention wherein the chain ##STR11## is in theexo-configuration, the hydrogen atom linked to the same carbon atom ofthe ring B having necessarily the α- absolute configuration, arereported as 6αH-6,9α-oxide (formula I; q=1) and 5αH-5,9α-oxide (formulaI; q=2) prostanoic acid derivatives (prostaglandin numbering), while thecompounds wherein the chain is in the endo-configuration, the hydrogenatom linked to the same carbon atom of the ring B having necessarily theβ-absolute configuration, are reported as 6βH-6,9α-oxide (formula I;q=1) and 5βH-5,9α-oxide (formula I; q=2) prostanoic acid derivatives(prostaglandin numbering). Alternatively the 6αH-6,9α-oxide prostanoicacid derivatives are reported as(2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-alkanoic acid derivatives, the5αH-5,9α-oxide prostanoic acid derivatives as(2'-oxa-bicyclo[4.3.0]nonan-3'-exo-yl)-alkanoic acid derivatives, the6βH-6,9α-oxide prostanoic acid derivatives as(2'-oxa-bicyclo[3.3.0]octan-3'-endo-yl)-alkanoic acid derivatives andthe 5βH-5,9α-oxide prostanoic acid derivative as(2'-oxa-bicyclo[4.3.0]nonan-3'-endo-yl)-alkanoic acid derivatives. The6αH-6,9α-oxide and 5αH-5,9α-oxide prostanoic acid derivatives have ahigher chromatographic mobility (i.e. a higher R_(f)) and a lesspositive rotatory power ([α]_(D)) than the corresponding 6βH-6,9α-oxideand 5βH-5,9α-oxide derivatives.

All the above notations refer to the natural compounds; thed,l-compounds are mixtures containing equimolar amounts of nat-compoundswhich possess the above reported absolute stereochemistry and ofent-compounds which are mirror-like images of the formers; in theent-compounds the stereochemical configuration is the opposite at allthe asymmetric centers with respect to the configuration of the naturalcompounds and the prefix ent indicates just this.

The alkyl, alkenyl, alkynyl, alkoxy, and alkanoyloxy groups are branchedor straight chain groups.

Preferably R is a free, salified or esterified carboxy group.

An ar-C₁ -C₆ -alkoxy group is preferably benzyloxy.

An aryl group is preferably phenyl, α-naphtyl or β-naphtyl.

A halo-C₁ -C₆ -alkyl group is preferably trihalo-C₁ -C₆ -alkyl, inparticular trifluoromethyl.

A C₁ -C₆ alkyl group is preferably methyl, ethyl or propyl.

A C₁ -C₆ alkoxy group is preferably methoxy, ethoxy or propoxy.

A C₂ -C₆ alkenyl radical is preferably vinyl.

A C₂ -C₆ alkynyl radical is preferably ethynyl.

When R is an esterified carboxy group it is preferably a --COOR_(c)group wherein R_(c) is a C₁ -C₁₂ alkyl radical, in particular methyl,ethyl, propyl and heptyl, or a C₂ -C₁₂ alkenyl radical, in particularallyl.

Preferably Z₁ is hydrogen.

When Z₁ is halogen, it is preferably chlorine or bromine. p Ispreferably an integer of 1 to 3.

When R₁ is acyloxy, it is preferably C₂ -C₁₂ alkanoyloxy (in particularC₂ -C₆ alkanoyloxy, e.g., acetoxy, propionyloxy) or benzoyloxy.

When Z₂ is halogen, it is preferably chlorine, bromine or iodine.

Preferably R₃ and R₄ are independently selected from the groupconsisting of hydrogen, C₁ -C₆ alkyl and fluorine.

n₁ Is preferably zero or an integer of 1 to 3; n₂ is preferably aninteger of 1 to 3.

When R₆ is a C₃ -C₉ cycloaliphatic radical, it is preferably a C₃ -C₉cycloalkyl radical e.g. cyclopentyl, cyclohexyl and cycloheptyl or a C₃-C₉ cycloalkenyl radical, e.g. cyclopentenyl, cyclohexenyl andcycloheptenyl.

When R₆ is a heterocyclic ring, it may be either a heteromonocyclic ringor a heterobicyclic ring and contains at least one heteroatom selectedfrom the group consisting of N, S and O.

Examples of preferred heteromonocyclic radicals are tetrahydrofuryl,tetrahydropyranyl, pyrrolyl, pyrazolyl, oxazolyl, isoxazolyl, pyridyl,pyrazinyl, pyrimidinyl, pyridazinyl.

Examples of preferred heterobicyclic radicals are2-oxa-bicyclo[3.3.0]octyl, 2-oxa-bicyclo[3.4.0]nonyl,2-thia-bicyclo[3.3.0]octyl, 2-thia-bicyclo[3.4.0]nonyl and theiraromatic analogs.

Pharmaceutically or veterinarily acceptable salts of the compounds offormula (I) are e.g. those with pharmaceutically and veterinarilyacceptable bases. Pharmaceutically and veterinarily acceptable bases areeither inorganic bases such as, for example, alkaline hydroxides andalkaline-earth hydroxides as well as aluminium and zinc hydroxides ororganic bases e.g. organic amines such as, for example, methylamine,dimethylamine, trimethylamine, ethylamine, dibutylamine,N-methyl-N-hexylamine, decylamine, dodecylamine, allylamine,cyclopentylamine, cyclohexylamine, benzylamine, dibenzylamine,α-phenyl-ethylamine, β-phenyl-ethylamine, ethylenediamine,diethylenetriamine, morpholine, piperidine, pyrrolidine, piperazine, aswell as the alkyl derivatives of the latter four bases, mono-, di- andtri-ethanolamine, ethyl-diethanolamine, N-methyl-ethanolamine,2-amino-1-butanol, 2-amino-2-methyl-1-propanol, N-phenyl-ethanolamine,galactamine, N-methyl-glucamine, N-methyl-glucosamine, ephedrine,procaine, dehydroabietilamine, lysine, arginine and other α or β aminoacids.

Preferred salts of the invention are those of the compounds of formula(I) wherein R is --COOR_(d) wherein R_(d) is a pharmaceutically orveterinarily acceptable cation deriving from one of the above mentionedbases.

Particularly preferred compounds of the invention are 6βH-6,9α-oxide and5βH-5,9α-oxide compounds of formula (I) wherein R is a free carboxygroup and R₆ is C₁ -C₄ alkyl, C₅ -C₇ cycloalkyl or optionallysubstituted phenyl. The prefixes nor, dinor, trinor, tetranor- etc., areused to identify the compounds of formula (I) wherein the side chainbound to the cyclopentane ring A is one, two, three, four, etc. carbonatoms shorter than the analogous chain in the natural prostaglandins.

Specific examples of preferred compounds of the invention are thefollowing:

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-prost-13-enoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-prost-13-ynoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-prostanoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-15-methyl-prost-13-enoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-15-methyl-prost-13-ynoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-15-methyl-prostanoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-15,20-dimethyl-prost-13-enoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-15,20-dimethyl-prost-13-ynoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-15,20-dimethyl-prostanoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-20-methyl-prost-13-enoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-20-methyl-prost-13-ynoic acid;

6βH-6,9α-oxide-11α,15S-dihydroxy-20-methyl-prostanoic acid;

13t-6βH-6,9α-oxide-15S-hydroxy-prost-13-enoic acid;

6βH-6,9α-oxide-15S-hydroxy-prost-13-ynoic acid;

6βH-6,9α-oxide-15S-hydroxy-prostanoic acid;

13t-6βH-6,9α-oxide-15S-hydroxy-15-methyl-prost-13-enoic acid;

6βH-6,9α-oxide-15S-hydroxy-15-methyl-prost-13-ynoic acid;

6βH-6,9α-oxide-15S-hydroxy-15-methyl-prostanoic acid;

13t-6βH-6,9α-oxide-15S-hydroxy-15,20-dimethyl-prost-13-enoic acid;

6βH-6,9α-oxide-15S-hydroxy-15,20-dimethyl-prost-13-ynoic acid;

6βH-6,9α-oxide-15S-hydroxy-15,20-dimethyl-prostanoic acid;

13t-6βH-6,9α-oxide-15S-hydroxy-20-methyl-prost-13-enoic acid;

6βH-6,9α-oxide-15S-hydroxy-20-methyl-prost-13-ynoic acid;

6βH-6,9α-oxide-15S-hydroxy-20-methyl-prostanoic acid;

13t-6,9α-oxide-11α,15S-dihydroxy-14-bromo-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-14-chloro-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-14-bromo-15-methyl-prost-13-enoicacid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-14-bromo-20-methyl-prost-13-enoicacid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-14-bromo-15,20-dimethyl-prost-13-enoicacid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16,16-dimethyl-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16-methyl-16-butoxy-20,19,18-trinor-prost-13-enoicacid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-20,19,18-trinor-prost-13-enoicacid and the single 16(S)- and 16(R)-fluoro isomer;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-17-cyclohexyl-20,19,18-trinor-prost-13-enoicacid;

6βH-6,9α-oxide-11α,15S-dihydroxy-17-cyclohexyl-20,19,18-trinor-prost-13-ynoicacid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16-phenoxy-20,19,18,17-tetranor-13-enoicacid and the p-fluoro, p-chloro, p-methoxy, o-fluoro, m-fluoro,m-trifluoromethyl, m-chloro-phenoxy analogs thereof;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-17-(2'-tetrahydrofuryl)-20,19,18-trinor-prost-13-enoicacid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-17-(2'-tetrahydrothienyl)-20,19,18-trinor-prost-13-enoicacid;

13t-6βH6,9α-oxide-11α,15S-dihydroxy-20-ethyl-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16-benzyloxy-20,19,18,17-tetranor-13-enoicacid and the p-fluoro, p-chloro, p-methoxy, o-fluoro, m-fluoro,m-trifluoromethyl, m-chloro-benzyloxy analogs thereof;

13t-5βH-5,9α-oxide-11α,15S-dihydroxy-prost-13-enoic acid;

13t-5βH-5,9α-oxide-11α,15S-dihydroxy-prostanoic acid;

13t-5βH-5,9α-oxide-11α,15S-dihydroxy-prost-13-ynoic acid;

13t-5βH-5,9α-oxide-11α,15S-dihydroxy-16S-methyl-prost-13-enoic acid;

13t-5βH-5,9α-oxide-11α,15S-dihydroxy-16R-methyl-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16S-methyl-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16R-methyl-prost-13-enoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16S-methyl-prost-13-ynoic acid;

13t-6βH-6,9α-oxide-11α,15S-dihydroxy-16R-methyl-prost-13-ynoic acid, aswell as the 5-bromo, the 5-iodo, the 5-chloro analogs of all the6βH-6,9α-oxide derivatives above listed, as well as the 4-bromo, the4-iodo, the 4-chloro analogs of all the 5βH-5,9α-oxide derivatives abovelisted, as well as the 15R-epimers, the 15-oxo-derivatives and the 6αH-and the 5αH-diastereoisomers of all the compounds mentioned above.

The compounds of the invention are prepared by a process comprising:

(a) halocyclizing a compound of formula (II) ##STR12## wherein p, q, Y,n₁, n₂, R₃, R₄, X and R₆ are as defined above, D is cis- or trans--CH═CH--, R" is (a") a free or esterified carboxy group; (b") a group##STR13## wherein each of the R' groups is as defined above; (c") thegroup --CH₂ --R₇, wherein R₇ is hydroxy or a known protecting groupbound to the --CH₂ -- group by an ethereal oxygen atom; ##STR14##wherein R_(a) and R_(b) are as defined above; (e") a radical of formula##STR15## (f) --C.tbd.N R'₁ is hydrogen, hydroxy, C₁ -C₆ alkoxy, ar-C₁-C₆ -alkoxy, acyloxy or a known protecting group bound to the ring by anethereal oxygen atom; one of R'₂ and R'₅ is hydrogen, C₁ -C₆ alkyl, C₂-C₆ alkenyl, C₂ -C₆ alkynyl or aryl and the other is hydroxy, C₁ -C₆alkoxy, ar-C₁ -C₆ -alkoxy or a known protecting group bound to the chainby an ethereal oxygen atom, or R'₂ and R'₅, taken together, form an oxogroup, so obtaining, after the removal of the known protecting groups,if present, a compound of formula (I) wherein Z₁ is halogen and, ifnecessary, deetherifying and/or, if desired, dehalogenating the obtainedcompound to give a compound of formula (I) wherein Z₁ is hydrogen; or

(b) reducing a compound of formula (III) ##STR16## wherein Q is halogenor a group Hg.sup.(+) Z.sup.(-), wherein Z.sup.(-) is OH.sup.(-) or theanionic residue of an acid, R, p, q, R₁, Y, R₂, R₅, R₃, R₄, n₁, n₂, Xand R₆ are as defined above, so obtaining a compound of formula (I)wherein Z₁ is hydrogen; or

(c) reacting a compound of formula (IV) ##STR17## wherein R", p, Z₁, q,and R₁ ' are as defined above, with a compound of formula (V) ##STR18##wherein E is a group (C₆ H₅)₃ P.sup.(+) -- or a group ##STR19## whereineach of the R_(e) groups, which are the same or different, is alkyl oraryl and Z₂, R₃, R₄, n₁, n₂, X and R₆ are as defined above, soobtaining, after the removal of the known protecting groups, if present,a compound of formula (I) wherein R₂ and R₅, taken together, form an oxogroup and Y is --CH═CZ₂ -- wherein Z₂ is as defined above and, ifdesired, reducing a compound of formula (I) wherein R₂ and R₅, takentogether, form an oxo group and Y is --CH═CZ₂ -- wherein Z₂ is asdefined above, to give a compound of formula (I) wherein one of R₂ andR₅ is hydrogen and the other is hydroxy and Y is --CH═CZ₂ --, wherein Z₂is as defined above, or, if desired, converting a compound of formula(I) wherein R₂ and R₅, taken together, form an oxo group and Y is--CH═CZ₂ -- wherein Z₂ is as defined above, into a compound of formula(I) wherein one of R₂ and R₅ is hydroxy and the other is C₁ -C₆ alkyl,C₂ -C₆ alkynyl or aryl and, if desired, etherifying a compound offormula (I) wherein one of R₂ and R₅ is hydroxy and the other ishydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ -C₆ alkynyl or aryl and Y is--CH═CZ₂ -- wherein Z₂ is as defined above, to give a compound offormula (I) wherein one of R₂ and R₅ is C₁ -C₆ alkoxy or ar-C₁ -C₆-alkoxy and the other is hydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ -C₆alkynyl or aryl and Y is --CH═CZ₂ -- wherein Z₂ is as defined above,and/or, if desired, hydrogenating a compound of formula (I) wherein Y is--CH═CZ₂ -- wherein Z₂ is hydrogen, to give a compound of formula (I)wherein Y is --CH₂ CH₂ -- or, if desired, dehydrohalogenating a compoundof formula (I) wherein Z₁ is hydrogen and Y is --CH═CZ₂ -- wherein Z₂ ishalogen, to give a compound of formula (I) wherein Y is --C.tbd.C-- andZ₁ is hydrogen or, if desired, hydrogenating a compound of formula (I)wherein R₂ and R₅, taken together, form an oxo group and Y is --CH═CZ₂-- wherein Z₂ is hydrogen, to give a compound of formula (I) wherein R₂and R₅, taken together, form an oxo group and Y is --CH₂ CH₂ -- or, ifdesired, dehydrohalogenating a compound of formula (I) wherein Z₁ ishydrogen, R₂ and R₅, taken together, form an oxo group, an Y is --CH═CZ₂-- wherein Z₂ is halogen, to give a compound of formula (I) wherein Z₁is hydrogen, R₂ and R₅, taken together, form an oxo group and Y is--C.tbd.C-- and, if desired, reducing a compound of formula (I) whereinR₂ and R₅, taken together, form an oxo group, to give a compound offormula (I) wherein one of R₂ and R₅ is hydrogen and the other ishydroxy, or, if desired, converting a compound of formula (I) wherein R₂and R₅, taken together, form an oxo group, into a compound of formula(I) wherein one of R₂ and R₅ is hydroxy and the other is C₁ -C₆ alkyl,C₂ -C₆ alkenyl, C₂ -C₆ alkynyl or aryl and, if desired, etherifying acompound of formula (I) wherein one of R₂ and R₅ is hydroxy and theother is hydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ -C₆ alkynyl or aryl,to give a compound of formula (I) wherein one of R₂ and R₅ is C₁ -C₆alkoxy or ar-C₁ -C₆ -alkoxy and the other is hydrogen, C₁ -C₆ alkyl, C₂-C₆ alkenyl, C₂ -C₆ alkynyl or aryl; and/or, if desired, converting acompound of formula (I) into another compound of formula (I) and/or, ifdesired, salifying a compound of formula (I) and/or, if desired,obtaining a free compound of formula (I) from a salt thereof and/or, ifdesired, separating a mixture of isomers into the single isomers.

In the optional steps of the above processes when only one or a fewsubstituents are specifically mentioned for a compound, it is understoodthat the other substituents have all the meanings previously indicatedfor formula (I).

The known protecting groups, i.e., ether groups, are convertible tohydroxy groups under mild reaction conditions, e.g., acid hydrolysis.Examples are acetal ethers, enol ethers and silyl ethers.

The preferred groups are ##STR20## wherein W is --O-- or --CH₂ -- andAlk is a lower alkyl group.

When in the compound of formula (III) Q represents a group Hg.sup.(+)Z.sup.(-), wherein Z.sup.(-) is the anionic residue of an acid,Z.sup.(-) is preferably selected from the group consisting ofCl.sup.(-), Br.sup.(-), I.sup.(-), R₈ -COO.sup.(-), wherein R₈ is anoptionally halo-substituted C₁ -C₁₂ alkyl group (preferably C₁ -C₆ alkylor trifluoromethyl) and ##STR21## wherein R₉ is, e.g., hydrogen, C₁ -C₆alkyl, halogen, e.g., bromine, or trifluoromethyl.

Preferably Z.sup.(-) is Cl.sup.(-), Br.sup.(-), CH₃ COO.sup.(-), CF₃COO.sup.(-) or ##STR22##

The halocyclization of a compound of formula (II) may be performed byreaction with either a stoichiometric amount or a small excess of ahalogenating agent in an inert solvent, in either the presence or inabsence of a base.

Preferred halogenating agents are, e.g., iodine, bromine, chlorine,bromodioxane, bromopyridine, Br₂.pyridine.HBr, KI₃,pyrrolidone-hydrotribromide, an N-haloamide such asN-chloro-succinimide, N-bromo-succinimide, N-iodo-succinimide, a cuprichalide such as CuCl₂ or CuBr₂, a mixed halide such as ICl or IBr, aswell as a mixture of an alkaline chloride with an alkaline chlorate, amixture of an alkaline bromide with an alkaline bromate or a mixture ofan alkaline iodide with an alkaline bromate.

Suitable solvents are, for example, halogenated hydrocarbons such asCHCl₃, CCl₄, CH₂ Cl₂ ; aliphatic hydrocarbons such as n-hexane,n-heptane; cycloaliphatic hydrocarbons such as cyclohexane; aromatichydrocarbons such as benzene, toluene, pyridine, cyclic or linearethers, e.g., dioxane, tetrahydrofuran, diethylether, dimethoxyethane;as well as mixtures thereof.

Preferred solvents are halogenated hydrocarbons, e.g. CH₂ Cl₂, sinceboth the compound of formula (II) and the halogenating agent are usuallysoluble in these solvents.

A stoichiometric amount of a base is necessary when a hydrohalic acid isformed during the halocyclization reaction. Such a base may be aninorganic base, e.g., an alkaline or an alkaline-earth oxide, carbonateor bicarbonate, e.g., CaO, CaCO₃ and K₂ CO₃, NaHCO₃, Na₂ CO₃ ; anorganic base such as a tertiary amine, e.g., triethylamine; or anaromatic base, e.g., pyridine or an alkyl-substituted pyridine; or ananionic ion-exchange resin.

The halocyclization reaction is preferably carried out at temperaturesranging from about -70° C. to about 100° C.; preferably the reaction isperformed at room temperature.

The reaction times range from few minutes to several days, but usuallydo not exceed two hours and often a few minutes are sufficient tocomplete the reaction.

When other unsaturated bonds are present in the compound of formula (II)besides the double bond contained in the substituent D, thoseunsaturated bonds may add halogen during the halocyclization reaction.The added halogen may be easily removed to reobtain the originalunsaturations, by treating the reaction product with an alkaline oralkaline-earth iodide in a suitable solvent such as, e.g., acetone attemperatures ranging from room temperature to reflux temperature butpreferably at room temperature. Reaction time may range from about 2-3hours to about 2-3 days.

The removal of the known protecting groups bound to the ring or to thechain by an ethereal oxygen atom is, whenever required, performed underconditions of mild acid hydrolysis, for example with a mono- orpoly-carboxylic acid such as formic, acetic, oxalic, citric and tartaricacid, and in a solvent, which may be water, acetone, tetrahydrofuran,dimethoxyethane or a lower aliphatic alcohol, or with a sulphonic acid,e.g., p-toluenesulphonic acid in a solvent such as a lower aliphaticalcohol, dry methanol or dry ethanol, for example, or with apolystyrene-sulphonic resin.

For example, 0.1 to 0.25 N poly-carboxylic acid (e.g., oxalic or citricacid) is used in the presence of a convenient low-boiling co-solventwhich is misible with water and which can be easily removed in vacuo atthe end of the reaction.

All the cyclization reactions described in this specification such ase.g. the hereabove described halocyclization of a compound of formula(II) to give a compound of formula (I) wherein Z₁ is halogen, theherebelow described cyclization of a compound of formula (II) to give acompound of formula (III) wherein Q is Hg.sup.(+) Z.sup.(-) and theherebelow described cyclization of a compound of formula (VI) areidentical reactions as to their mechanism and the number of the isomerscontained in the reaction mixture is the same for all the abovecyclizations. Thus for example the above halocyclization reaction of acompound of formula (II) can give to a mixture of four components, i.e.compounds of formula (I) wherein Z₁ is halogen, consisting in a coupleof diastereoisomers having the side chain ##STR23## in theexo-configuration and differing each other for the S or R configurationof the halogen Z₁ and a couple of diastereoisomers having the side chain##STR24## in the endoconfiguration and differing each other for the S orR configuration of the halogen Z₁.

While the chromatographic mobility (R_(f)) of the endo-isomer is clearlydifferent from the chromatographic mobility of the exoisomer, thedifference of R_(f) between two endo- (or exo-) isomers differing eachother only for the S or R configuration of the Z₁ substituent, is verysmall.

The couple of diastereoisomers wherein the chain ##STR25## is in theexo-configuration may be separated from the couple of diastereoisomerswherein said chain is in the endo-configuration by fractionalcrystallization e.g. from diethylether but preferably by tin layerpreparative chromatography, by column chromatography or by high speedliquid chromatography.

The separation by tin layer preparative chromatography or by columnchromatography is preferably carried out on a support of silica gel ormagnesium silicate with methylene chloride, diethylether,isopropylether, ethylacetate, benzene, methyl acetate, cyclohexane ortheir mixtures as elution solvents.

The reductive dehalogenation of a compound of formula (I) wherein Z₁ ishalogen, to give a compound of formula (I) wherein Z₁ is hydrogen, isperformed by reduction, e.g., with chromous acetate or a hydride such astri(n-butyl)tin hydride, or by catalytic hydrogenation.

When it is desired to obtain a compound of formula (I) wherein Y is--C.tbd.C-- or --CH═CZ₂ -- wherein Z₂ is as defined above, thedehalogenation is carried out only by reduction, e.g., withtri(n-butyl)tin hydride or chromous acetate.

When it is desired to obtain a compound of formula (I) wherein R₂ and R₅taken together form an oxo group, by the dehalogenation of the compoundof formula (I) wherein Z₁ is halogen, the reaction time should notexceed half an hour.

When the reductive dehalogenation is carried out with chromous acetate,this reagent is added, with stirring, to a cooled solution of thecompound of formula (I) wherein Z₁ is halogen, in a mixture of ethanoland aqueous sodium or potassium hydroxide under an atmosphere ofnitrogen. The reaction mixture is then stirred one to three days at roomtemperature, according to the method described in J.Am.Chem.Soc. 76,5499 (1954).

When the dehalogenation is carried out with tri(n-butyl)tin hydride,about 1.2 equivalents of the reducing agent are used for each equivalentof the compound of formula (I) wherein Z₁ is halogen. Suitable solventsfor the reaction are aromatic hydrocarbons such as benzene or tolueneand the temperatures preferably are between room temperature and about70° C.

Preferably the reaction is carried out at about 55° C. in benzene andlasts about 12 hours.

The catalytic hydrogenation of a compound of formula (I) wherein Z₁ ishalogen to give a compound of formula (I) wherein Z₁ is hydrogen and Yis --CH₂ CH₂ -- may be performed either at room temperature or byheating this compound, e.g., at 30°-60° C. either at atmosphericpressure or under pressure, e.g., at 1.1-2 atm, in a solvent such as,e.g., a lower aliphatic alcohol, tetrahydrofuran, dioxane, benzene,toluene in the presence of a catalyst such as palladium or platinum oncharcoal or CaCO₃ and optionally in the presence of an ammonium salt,e.g., ammonium acetate or proprionate.

The reductive dehalogenation converts a compound of formula (I) whereinZ₁ is halogen into a compound of formula (I) wherein Z₁ is hydrogen andtherefore during the dehalogenation the carbon atom carrying the Z₁substituent loses its asymmetry.

The number of the possible diastereoisomers consequently contained inthe dehalogenation reaction mixture is lower than the number ofdiastereoisomers contained in the halocyclization reaction mixture. Whenthe reductive dehalogenation is carried out directly on the mixture offour diastereoisomers obtained from the halocyclization process, amixture of two only diastereoisomers of formula (I) wherein Z₁ ishydrogen is obtained, differing each other for the exo- orendo-configuration of the side chain CH₂ --(CH₂)_(p) --R.

When the reductive dehalogenation is carried out on a single couple ofdiastereoisomers of formula (I) having the side chain ##STR26## whereinZ₁ is halogen, in the exo- or in the endo-configuration and differingeach other for the S or R configuration of Z₁, then only one isomer offormula (I) wherein Z₁ is hydrogen is obtained wherein the side chainCH₂ --(CH₂)_(p) --R is in the exo- or in the endo-configuration.

If a mixture of the above diastereoisomers is obtained the singlediastereoisomers may be easily separated by fractional crystallizationor by column chromatography as described above for the separation of thediastereoisomers wherein Z₁ is halogen.

The reduction of the compound of formula (III) may be carried out bytreatment with mixed hydrides such as alkaline, e.g., sodium, potassiumor lithium, borohydrides, with alkaline-earth, e.g., calcium ormagnesium, borohydrides in an inert solvent, preferably a solventmiscible with water, such as tetrahydrofuran, dimethoxyethane or loweraliphatic alcohols, e.g. methanol or ethanol; or with tri(n-butyl) tinhydride in benzene or toluene, preferably benzene; or also by treatmentwith hydrazine hydrate in a lower aliphatic alcohol, e.g., methanol orethanol as solvent, at temperatures varying from room temperature to thereflux temperature of the solvent used.

When it is desired to obtain compounds of formula (I) wherein Z₁ ishydrogen and R₂ and R₅ taken together form an oxo group, the reductionof the compound of formula (III) is preferably carried out withtri(n-butyl) tin hydride for a short reaction time, preferably a timevarying from about 5 minutes to about half an hour.

During the above reduction of a compound of formula (III) the carbonatom carrying the Q substituent loses its asymmetry and therefore thenumber of the possible diastereoisomers contained in the reactionmixture at the end of the reduction process is half the number of thediastereoisomers contained in the starting material, analogously to whatabove reported with regards to dehalogenation of a compound of formula(I) wherein Z₁ is halogen.

When in the compound (V) E is ##STR27## wherein R_(e) is aryl, it ispreferably phenyl; when R_(e) is alkyl, it is preferably C₁ -C₆ alkyl.The reaction between an aldehyde of formula (IV) and a compound offormula (V) is carried out with an excess of the compound of formula(V), e.g., at least 1.01 molar equivalent of the compound of formula (V)for each mole of the compound of formula (IV).

Any inert solvent can be used, such as linear and cyclic ethers, e.g.ethyl ether, tetrahydrofuran, dioxane, dimethoxyethane, aliphatic oraromatic hydrocarbons, e.g., n-heptane, n-hexane, benzene, toluene orhalogenated hydrocarbons, e.g. methylenechloride, tetrachloroethane andalso mixtures of these solvents. The reaction temperature may varybetween the freezing and the boiling points of the solvent.

When the reaction is carried out with a compound of formula (V) whereinE is ##STR28## the preferred temperature is the room temperature i.e.from about 10° C. to about 25° C., when the reaction is carried out witha compound of formula (V) wherein E is (C₆ H₅)₃ P-.sup.(+), thepreferred temperature is the reflux temperature of the solvent.

The product of the reaction between a compound of formula (IV) and acompound of formula (V) is a mixture of a compound of formula (I)wherein Y is trans-CH═CZ₂ -- wherein Z₂ is as defined above and acompound of formula (I) wherein Y is cis-CH═CZ₂ -- wherein Z₂ is asdefined above, in a ratio varying between approximately 90:10 and 95:5.

The compound of formula (I) wherein Y is trans-CH═CZ₂ -- wherein Z₂ isas defined above, may be separated from the mixture by crystallizationwith a suitable solvent, while the compound of formula (I) wherein Y iscis-CH═CZ₂ -- wherein Z₂ is as defined above, may be obtained byconcentration of the mother liquor and subsequent chromatographicseparation of the residue, either by column or preparative TLCchromatography using silica gel or magnesium silicate as support ande.g. methylene chloride, diethylether, isopropylether, ethylacetate,benzene, cyclohexane or their mixtures as elution solvents.

The removal of the protecting groups, if present, may be performed bymild acid hydrolysis as described above for the compounds obtained bythe halocyclization and the reduction processes. Either the optionalreduction of a compound of formula (I) wherein R₂ and R₅, taken togetherform an oxo group, and Y is --CH═CZ₂ --, wherein Z₂ is as defined above,to give a compound of formula (I) wherein Y is --CH═CZ₂ --, wherein Z₂is as defined above and wherein one of R₂ and R₅ is hydrogen and theother is hydroxy or the optional conversion of a compound of formula (I)wherein R₂ and R₅, taken together, form an oxo group and Y is --CH═CZ₂-- wherein Z₂ is as defined above, into a compound of formula (I)wherein Y is --CH═CZ₂ --, wherein Z₂ is as defined above, and whereinone of R₂ and R₅ is hydroxy and the other is C₁ -C₆ alkyl, C₂ -C₆alkenyl, C₂ -C₆ alkynyl or aryl must be regarded as differentapplications of one only reaction which is a 1.2 polar addition to thecarbonyl group. The optional reduction of an obtained compound offormula (I) wherein R₂ and R₅ taken together form an oxo group, and Y is--CH═CZ₂ --, wherein Z₂ is as defined above, to give a compound offormula (I) wherein Y is --CH═CZ₂ --, wherein Z₂ is as defined above,and wherein one of R₂ and R₅ is hydrogen and the other is hydroxy, ispreferably carried out with alkaline or alkaline-earth metalborohydrides, preferably sodium, lithium, calcium, magnesium or zincborohydride, using from 0.5 to 6 moles of the reducing agent for eachmole of the compound of formula (I). The reduction may be performedeither in aqueous or anhydrous inert solvents, such as linear or cyclicethers, e.g., ethyl ether, tetrahydrofuran, dimethoxyethane, dioxane oraliphatic or aromatic hydrocarbons, e.g., n-heptane or benzene, orhalogenated hydrocarbons, e.g. methylene dichloride, or hydroxylatedsolvents, e.g., ethyl, methyl or isopropyl alcohol, or mixtures of thesesolvents. The reaction temperature may vary between approximately -40°C. and the boiling point of the solvent used, but the preferredtemperature ranges from about -20° C. to about 25° C.

This reduction leads to a mixture of the two epimeric S ##STR29## and R##STR30## alcohols from which the single epimers can be separated, ifdesired, by fractional crystallization, e.g. with diethylether,n-hexane, n-heptane, cyclohexane but preferably by chromatography eitheron silica gel or magnesium silicate columns or preparative TLCchromatography with, for example, silica gel, eluting, e.g., with CH₂Cl₂, ethyl ether, isopropyl ether, ethyl acetate, methyl acetate,benzene, cyclohexane or mixtures of these, or by high speed liquidchromatography.

The optional conversion of a compound of formula (I) wherein R₂ and R₅taken together form an oxo group and Y is --CH═CZ₂ --, wherein Z₂ is asdefined above, into a compound of formula (I) wherein one of R₂ and R₅is hydroxy and the other is C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ -C₆ alkynylor aryl and Y is --CH═CZ₂ -- wherein Z₂ is as defined above, may becarried out by treatment with a Grignard reagent of formula R'"-MgHal,wherein Hal is halogen, preferably bromine or iodine and R'" is C₁ -C₆alkyl, C₂ -C₆ alkynyl, C₂ -C₆ alkenyl or aryl, preferably methyl, vinyl,ethynyl, phenyl.

The Grignard reaction is carried out with 1.05 to 2 moles of themagnesium derivative for each mole of ketone, operating in anhydroussolvents which may be linear or cyclic ethers, e.g., ethyl ether,tetrahydrofuran, dioxane, dimethoxyethane or aliphatic or aromatichydrocarbons, e.g., n-heptane, n-hexane, benzene, toluene, attemperatures varying from approximately -70° C. to the boiling point ofthe solvent used. The preferred temperatures range between -60° C. and10° C.

The optional etherification of a compound of formula (I) wherein Y is--CH═CZ₂ --, wherein Z₂ is as defined above, and one of R₂ and R₅ ishydroxy and the other is hydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ -C₆alkynyl or aryl to give a compound of formula (I) wherein Y is --CH═CZ₂--, wherein Z₂ is as defined above, and one of R₂ and R₅ is C₁ -C₆alkoxy or aralkoxy and the other is hydrogen, C₁ -C₆ alkyl, C₂ -C₆alkenyl, C₂ -C₆ alkynyl or aryl, may be carried out, for example, byreaction with an optionally aryl-substituted diazoalkane in the presenceof a catalyst such as fluoboric acid or borontrifluoride and in anorganic solvent such as dichloromethane or by reaction of the free orsalified hydroxy group with an alkyl or aralkyl halide in presence of abase such as silver oxide and in a solvent such as dimethylsulphoxide ordimethylformamide.

The optional hydrogenation of a compound of formula (I) wherein Y is--CH═CZ₂ --, wherein Z₂ is hydrogen, to give a compound of formula (I)wherein Y is --CH₂ --CH₂ -- is carried out e.g., catalytically,preferably in an alcoholic solvent, in the presence of platinum orpalladium on charcoal as catalyst at temperatures varying from about-40° C. to the reflux temperature of the solvent. When it is desired toobtain compounds of formula (I) wherein Z₁ is halogen and Y is --CH₂--CH₂ -- the hydrogenation is preferably carried out at temperaturesranging from about -40° C. to about -20° C.

The optional dehydrohalogenation of a compound of formula (I) wherein Z₁is hydrogen, and Y is --CH═CZ₂ --, wherein Z₂ is halogen, so as toobtain the corresponding compounds of formula (I) wherein Z₁ is hydrogenand Y is --C.tbd.C--, may be carried out using a dehydrohalogenatingagent preferably selected from the group consisting of adimethylsulfinylcarbanion of formula CH₃ SOCH₂.sup.(-),diazabicycloundecene, diazabicyclonene, the amide or the alkoxide of analkaline metal. From 1 to 5, and preferably from 1.5 to 1.8, molarequivalents of the basic dehydrohalogenating agent may be employed foreach mole of the compound of formula (I) wherein Y is --CH═CZ₂ --,wherein Z₂ is halogen.

This dehydrohalogenation process is preferably carried out in theabsence of atmospheric oxygen, in an inert solvent such asdimethylsulphoxide, dimethylformamide, hexamethylphosphoramide; a linearor cyclic ether, e.g., dimethoxyethane, tetrahydrofuran, dioxane; anaromatic hydrocarbon, e.g., benzene, toluene; or liquid ammonia or amixture of these solvents. The reaction temperature may vary between theliquefaction point of the ammonia and approximately 100° C., but thepreferred temperature is room temperature.

Depending on the solvent, the reaction temperature and the molar ratioused between the reagent and the compound, the reaction time may varyfrom a few minutes to several hours.

The optional reduction of a compound of formula (I) wherein R₂ and R₅taken together form an oxo group and Y is --CH₂ --CH₂ -- or --C.tbd.C--to give a compound of formula (I) wherein one of R₂ and R₅ is hydrogenand the other is hydroxy and Y is --CH₂ --CH₂ -- or --C.tbd.C-- may becarried out as described above for the analogous reduction of a compoundof formula (I) wherein R₂ and R₅ taken together form an oxo group and Yis --CH═CZ₂ --, wherein Z₂ is as defined above. The optional conversionof a compound of formula (I) wherein R₂ and R₅ taken together form anoxo group and Y is --CH₂ --CH₂ or --C.tbd.C-- into a compound of formula(I) wherein one of R₂ and R₅ is hydroxy and the other is C₁ -C₆ alkyl,C₂ -C₆ alkenyl, C₂ -C₆ alkynyl or aryl may be effected under the samereaction conditions described above for the analogous conversion of thecompounds of formula (I) wherein Y is --CH═CZ₂ --, wherein Z₂ is asdefined above.

Also the optional etherification of a compound of formula (I) whereinone of R₂ and R₅ is hydroxy and the other is hydrogen or C₁ -C₆ alkyl,C₂ -C₆ alkenyl, C₂ -C₆ alkynyl or aryl and Y is --CH₂ --CH₂ -- or--C.tbd.C-- may be carried out as described above for the etherificationof a compound of formula (I) wherein one of R₂ and R₅ is hydroxy and theother is hydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₁ -C₆ alkynyl or aryland Y is --CH═CZ₂ --, wherein Z₂ is as defined above.

The optional conversion of a compound of formula (I) into anothercompound of formula (I) as well as the salification of a compound offormula (I), the preparation of a free compound from a salt and theseparation of the isomers from a mixture may be carried out by knownmethods.

Thus, for example, a compound of formula (I) wherein one of R₂ and R₅ ishydrogen and the other is hydroxy may be converted into a compound offormula (I) wherein R₂ and R₅ taken together form an oxo group byoxidation. The oxidation may be carried out by treatment with an excessof activated manganese dioxide in an inert solvent preferably ahalogenated inert solvent such as dichoromethane or chloroform at roomtemperature for a reaction time varying between several hours and one ormore days.

Alternatively, the oxidation may be carried out by reaction with a1.1-1.2 molar equivalent of dichlorodicyanobenzoquinone (DDQ) in aninert solvent such as dioxane, tetrahydrofuran, benzene or a mixture ofthese at temperatures ranging from about 40° C. to the boiling point ofthe solvent. A compound of formula (I) wherein R is a free carboxy groupmay be converted into a compound of formula (I) wherein R is anesterified carboxy group, e.g., a C₁ -C₁₂ carbalkoxy group, by knownmethods, e.g., by reaction with the appropriate alcohol, e.g., a C₁ -C₁₂aliphatic alcohol, in the presence of an acid catalyst, e.g.,p-toluenesulphonic acid and also by treatment with a diazoalkane. Theoptional conversion of a compound of formula (I) wherein R₁ is hydroxyinto a compound of formula (I) wherein R₁ is acyloxy, if desired, may beperformed in a conventional manner, e.g., by treatment with an anhydrideor a halide, such as a chloride of the appropriate carboxylic acid inthe presence of a base. When one of R₂ and R₅ is hydroxy, this hydroxygroup may be protected before the acylation by one of the knownprotecting group mentioned above.

The optional conversion of a compound of formula (I) wherein R is anesterified carboxy group into a compound of formula (I) wherein R is afree carboxy group, if desired, may be carried out by the usual methodsof saponification, e.g., by treatment with an alkaline or alkaline-earthhydroxide in aqueous or alcohoic aqueous solution followed byacidification. In a compound of formula (I) wherein R is an esterifiedcarboxy and R₁ is acyloxy, the optional saponification may be carriedout selectively with respect to the esterified carboxy, if desired, bytransesterification, i.e., by reacting it in the same alcohol whichesterifies the carboxy groups and in the presence of a base such as analkaline or alkaline-earth alkoxide or K₂ CO₃.

The optional conversion of a compound of formula (I) wherein R₁ ishydroxy into a compound of formula (I) wherein R₁ is C₁ -C₆ alkoxy oraralkoxy, if desired, may be carried out by the usual methods of theetherification, for example as described above for the etherification ofa compound of formula (I) wherein one of R₂ and R₅ is hydroxy.

When it is desired to etherify only one of several hydroxyl functionspresent it is useful to protect before the etherification the hydroxygroups which it is desired to not etherify, e.g., with the knownprotecting groups above mentioned, then removing these at the end of theetherification by the procedures already described above.

The optional conversion of a compound of formula (I) wherein R is a freeor esterified carboxy group into a compound of formula (I) wherein R is--CH₂ --OH, if desired, may be carried out, e.g., by reducing the esterwith LiAlH₄ in ethyl ether or tetrahydrofuran at reflux temperature.

The optional conversion of a compound of formula (I) wherein R is a freecarboxy group into a compound of formula (I) wherein R is ##STR31##wherein R_(a) and R_(b) are as defined above, may be performed bytreatment with an amine of formula NHR_(a) R_(b) in the presence of acondensing agent, e.g., a carbodiimide such as dicyclohexylcarbodiimide,and the optional conversion of a compound of formula (I) wherein R is anesterified carboxy into a compound of formula (I) wherein R is ##STR32##may be effected by treatment with an amine of formula NHR_(a) R_(b) in asuitable organic solvent at reflux temperature for 2-3 hours.

The optional conversion of a compound of formula (I) wherein R is a freecarboxy group into a compound of formula (I) wherein R is a radical##STR33## may be carried out by converting the carboxy group into thecorresponding halide, preferably chloride, e.g., by reaction withthionyl chloride or oxalyl chloride in dioxane or dichloroethane atreflux temperature, then reacting the halide, e.g., with ammonia, togive the amide, dehydrating the amide to nitrile, e.g., withp-toluenesulphonylchloride in pyridine at approximately 90° C.-100° C.,and finally reacting the nitrile with sodium azide and ammonium chloridein dimethylformamide at a temperature varying between the roomtemperature and 100° C. But preferably the hereabove reportedconversions of the carboxy group into --CN or ##STR34## are performed onthe starting materials i.e. for example on the compounds of formula (II)and (VI).

The optional salification of a compound of formula (I) may be performedin a conventional manner.

Also the optional separation of the optically active compounds from aracemic mixture as well as the optional separation of thediastereoisomers or of the geometrical isomers from their mixtures maybe effected by conventional methods.

The compounds of formula (II) are already known compounds and may beprepared, e.g., as described by E. J. Corey et al, Ann. of New YorkAcad. of Sciences, 180, 24 (1971), by J. Fried et al, J.Med.Chem. 16,429 (1973), G. L. Bundy et al, Amer.Chem.Soc. 94, 2124 (1972), Gandolfiet al, Il Farmaco Ed.Sc. 27, 1125 (1972), in the U.S. Pat. No.3,935,254, Derwent Farmdoc 20717 X, in the German Offenlegunsschrift No.26 11 788 (Derwent Farmdoc 61615X), in the German Offlenegungsshrift No.26 10 503 (Derwent Farmdoc 59715X), in the German OffenlegungsschriftNo. 26 27 422 (Derwent Farmdoc 85028X), in the U.S. Pat. No. 3,706,789,in the U.S. Pat. No. 3,728,382, in the U.S. Pat. No. 3,903,131, in theU.S. Pat. No. 3,962,293, in the U.S. Pat. No. 3,969,380, Derwent Farmdoc73279U, Derwent Farmdoc 31279T, in the U.S. Pat. No. 3,890,372, in theU.S. Pat. No. 3,636,120, in the U.S. Pat. No. 3,883,513, in the U.S.Pat. No. 3,932,389, in the U.S. Pat. No. 3,932,479, Derwent Farmdoc19594W, Derwent Farmdoc 54179 U and in the British Patent No. 1,483,880.

The compound of formula (III) wherein Q is halogen may be obtained bythe same reaction described above for the synthesys of the compound offormula (I) wherein Z₁ is halogen.

The compound of formula (III) wherein Q is a group HG.sup.(+) Z.sup.(-)wherein Z.sup.(-) is as defined above may be prepared by cyclizing acompound of formula (II) in the presence of a source of Hg.sup.(++)ions.

Suitable sources of Hg.sup.(++) ions may be, e.g., either compounds offormula Hg(Z)₂ or compounds of formula Hg(OH)Z.

The above cyclization may be performed, e.g., using 1.01 to 1.5,preferably 1.2, equivalents of the mercuric compound for each mole ofthe compound of formula (II), in an organic solvent miscible with water,e.g., tetrahydrofuran, methanol, ethanol or in a mixture of the organicsolvent and water. The reaction temperature may vary between 0° C. andthe boiling point of the reaction mixture and the reaction time rangesfrom about 5 minutes to about 2 hours. The cyclization gives a mixtureof four diastereoisomers of formula (III) differing from each other forthe configuration (endo or exo) of the side chain linked to theheterocyclic ring B or for the configuration (S or R) of the Qsubstituent.

The separation of the diastereoisomers from their mixture, which may becarried out according to known methods, e.g., those already describedabove, may be effected at this point or, if desired, after the reductionof the compound of formula (III).

The compound of formula (IV) wherein Z₁ is halogen may be prepared byhalocyclization of a compound of formula (VI) ##STR35## wherein R",p,q,D and R'₁ are as defined above and G is a protected aldehydic group or aprotected -CH₂ OH group, preferably a member selected from the groupconsisting of ##STR36## wherein R₁₀ is C₁ -C₆ alkyl; ##STR37## whereinn₃ is an integer of 2 to 4, preferably 2 or 3; --CH₂ --O--CH₂ --C₆ H₅ or--CH₂ --O--CH₂ SCH₃, followed by the removal of the protecting groupsand by the selective oxidation of --CH₂ OH, when obtained, to --CHO.

The halocyclization of the compound of formula (VI) may be performedusing the same reaction conditions described above for the conversion ofa compound of formula (II) into a compound of formula (I) wherein Z₁ ishalogen.

The removal of the protecting group from the aldehydic or alcoholicfunctions may be carried out by mild acid hydrolysis in the sameconditions already described in this specification for the removal ofthe protecting groups (i.e. ether groups) of the hydroxylic functions.The selective oxidation of --CH₂ OH to --CHO may be effected in aconventional manner, e.g. by treatment with an excess of at least 3moles per mole of primary alcohol of dicyclohexylcarbodiimide inbenzene-dimethylsulphoxide and in the presence of an acid catalyst,e.g., pyridine trifluoroacetate or phosphoric acid.

The compound of formula (IV) wherein Z₁ is hydrogen may be preparedeither by the dehalogenation of a compound of formula (IV) wherein Z₁ ishalogen according to the method reported above for the conversion of acompound of formula (I) wherein Z₁ is halogen into a compound of formula(I) wherein Z₁ is hydrogen or by a process comprising the cyclization ofa compound of formula (VI) in the presence of a source of Hg.sup.(++)ions [as already described for the preparation of a compound of formula(III) wherein Q is Hg.sup.(+) Z.sup.(-) ] and the subsequent reductionof the obtained compound using the same reaction conditions employed forthe reduction of a compound of formula (III).

The compound of formula (V) wherein E is ##STR38## may be prepared bytreatment of a phosphonate of formula (VII) ##STR39## wherein R_(e), Z₂,n₁, R₃, R₄, X, n₂ and R₆ are as defined above, with at least anequivalent of a base preferably selected from the group consisting of analkaline or alkaline-earth hydride, e.g., sodium, potassium, lithium orcalcium hydride; an alkaline alkoxide, e.g., sodium or potassiumtert.butoxide; an alkaline or alkaline-earth metal amide, e.g., sodiumamide; an alkaline or alkaline-earth derivative of a carboxy-amide,e.g., sodium acetamide or sodium succinimide.

The compound of formula (V) wherein E is (C₆ H₅)₃ P--.sup.(+) may beprepared by reacting a compound of formula (VIII) ##STR40## wherein Z₂,n₁, R₃, R₄, X, n₂, R₆ are as defined above and Hal is a halogen atom,with 1-1.2 molar equivalent of triphenylphosphine in an inert organicsolvent such as e.g. benzene, acetonitrile, diethylether, then treatingthe triphenylphosphonium halide so obtained with an equivalent amount ofan inorganic base such as, for example, NaOH, KOH, Na₂ CO₃, NaHCO₃.

The compound of formula (VI) may be prepared, e.g., according toTetrahedron Letters No. 42, 4307-4310 (1972).

The compound of formula (VII) wherein Z₂ is halogen may be obtained byhalogenating a compound of formula (VII) wherein Z₂ is hydrogen in aconventional manner, operating substantially as in the halogenation ofβ-ketoesters.

The compounds of formula (VII) wherein Z₂ is hydrogen may be prepared byknown methods, e.g. according to E. J. Corey et al, J. Am. Chem. Soc.90, 3247 (1968) and E. J. Corey and G. K. Kwiatkowsky, J.Am.Chem.Soc.,88, 5654 (1966).

The compounds of formula (VIII) are known compounds or may be preparedby known methods.

The compounds of the invention can be used, in general, for the sametherapeutic indications as the natural prostaglandins in either human orveterinary medicine.

In particular, those having an acetylene bond in the 13,14-positioninstead of an ethylene and those with mono and di-substituents such asmethyl and fluorine groups have the advantages of superior resistance todegradation by the 15-PG-dehydrogenase enzymes, which quickly inactivatenatural compounds, and, of a more selective therapeutic action, asindicated below.

In order to obtain a preliminary biological profile, i.e., to assesswhether the compounds of the invention possess PG-like or thromboxane(TXA₂)-like or PGX-like activity, they were at first tested by asuperfusion cascade technique by the method of Piper and Vane, Nature223, 29 (1969).

In order to increase the sensitivity of the bioassay, a mixture ofantagonists [Gilmore et al. Nature 218, 1135 (1968)] is added to theKrebs-Henseleit and indomethacin (4 μg/ml) is also added to prevent theendogenous biosynthesis of prostaglandins.

Contraction of rat colon (RC), rat stomach strip (RSS) and bovinecoronary artery (BCA), and relaxation of rabbit mesentery artery (RbMA)are assumed to represent prostaglandin-like activity. TXA₂ -likeactivity is indicated when RbMA is contracted and must be confirmed byin vitro platelet pro-aggregation activity, since PGF₂α -like compoundsalso contract RbMA, as opposed to PGE. Finally, PGX-like activity isindicated by the relaxation of BCA, and is confirmed by in vitroplatelet anti-aggregation activity.

Synthetic PGE₂ and both the biosynthetic TXA₂ and PGX are utilized asstandard compounds.

They are active at a range of concentrations from 1-5 μg/ml. Thecompounds of the invention were dissolved in a few drops of ethanol justbefore testing; the stock solution was prepared in 0.1 M tris-buffer, pH9.0, (1 mg/ml) and diluted with Krebs-Henseleit to the requiredconcentration.

The compound 13-trans-11α,15S-dihydroxy-6βH-6,9α-oxide-prostenoic acidwas taken as the parent compound and is called 6βH-6,9α-oxide; thediastereoisomer 13-trans-11α,15S-dihydroxy-6αH-6,9α-oxide-prostenoicacid is then referred to as 6αH-6,9α-oxide. The chemical names of theother tested compounds are also referred to those of the parentcompounds. The compounds were tested at concentrations up to 100 ng/ml.

The results obtained showed that, in general, the 6βH-diastereoisomers,e.g., the compounds 6βH-6,9α-oxide, dl-6βH-5-bromo-6,9α-oxide,6βH-6,9α-oxide,-16-m-CF₃ -phenoxy-ω-tetranor and6βH-6,9α-oxide-16-m-chloro-phenoxy-ω-tetranor possess BCA-relaxingactivity and therefore have PGX-like activity.

Among the 6βH-derivatives, only the compounddl-6βH-6,9α-oxide-16-methyl-16-butoxy-ω-tetranor showed aBCA-contracting activity. The 6αH-derivatives, e.g. the compound6αH-6,9α-oxide, dl-6αH-5-bromo-6,9α-oxide,dl-6αH-6,9α-oxide-16-methyl-16-butoxy-ω-tetranor, 6H-6,9α-oxide-16-m-CF₃-phenoxy-ω-tetranor and 6αH-6,9α-oxide-16-m-chloro-phenoxy-ω-tetranoralso showed BCA-contracting activity.

In general, the exo-configuration is associated with BCA contraction.Furthermore, the compounds of the invention have hypotensive activity inmammals as does the natural compound PGX. However, as compared to PGX,they have the great advantage of a higher chemical stability and can beused in pharmaceutical formulations.

The hypotensive activity was demonstrated by the limb perfusion test.During the perfusion of the rat's left leg, through the left femoralartery, with a constant perfusion pressure, both the 6βH-- and6αH-6,9α-oxide compounds caused a lowering of the values of the meanperfusion pressure at all the doses, over the range from 0.05-1 μg (to-42,5% for 6βH and -32% for 6αH). Moreover, the systemic pressure, bothsystolic and diastolic, was depressed from 0.05 μg/kg up to 5 μg/kg(about -45%).

Because of their hypotensive and vasodilatory activity, the compounds ofthe invention are useful for treatment of cases of gangrene of the lowerlimbs. For this therapeutic use, they have been found to be more activethan PGE₁ and PGE₂. They are also useful in disturbances of theperipheral vasculature and, therefore in the prevention and treatment ofdiseases such as phlebitis, hepato-renal syndrome, ductus arteriosus,non-obstructive mesenteric ischemia, arteritis and ischemic ulcerationsof the leg.

Among the compounds of the invention, in particular, the 6βH-derivativesalso have a high anti-aggregating activity.

Among the 6βH compounds, the more important ones are, in order ofincreasing potency, compounds dl-6βH-5-bromo-6,9α-oxide,6βH-6,9α-oxide-16-m-CF₃ -phenoxy-ω-tetranor, dl-6βH-6,9α-oxide, and6βH-6,9α-oxide.

Using platelet-rich plasma (PRP) from healthy human donors who had nottaken any drugs for at least one week, and monitoring plateletaggregation by continous recording of light transmission in a Bornaggregometer [Born G.V.R., Nature (London) 194, 927 (1962)] there isevidence that the compounds 6βH-6,9α-oxide, dl-6βH-5-bromo-6,9α-oxide,6βH-6,9α-oxide-16-m-CF₃ -phenoxy-ω-tetranor and6βH-6,9α-oxide-16-m-chloro-phenoxy-ω-tetranor mimic the biosynthetic PGXin its platelet-antiaggregating properties.

The compounds investigated were incubated for 2-3 minutes at 37° C. inthe PRP prior to the addition of the aggregating agents, arachidonicacid (0.4 mM), ADP (10 μM), collagen (38 μM) or adrenaline (15 μM). Thepotency ratio for the compound is, e.g., 1:10 for arachidonicacid-induced aggregation and 1:100 for ADP-induced aggregation, ascompared with biosynthetic PGX.

A very interesting increase in the anti-aggregating potency follows20-methyl substitution in both the 6βH- and 6αH-6,9α-oxide parentcompounds.

Similarly, 6βH-5-bromo-20-methyl, 6βH-5,14-dibromo,6βH-13,14-didehydro-20-methyl and finally 6βH-5-bromo-13,14-didehydrocompounds and their 6βH-5-iodo (but not 6αH-5-iodo isomers) are veryactive compounds as anti-aggregating agents.

The compounds of the invention are, therefore, particularly useful inmammals for inhibiting platelet aggregation, for preventing andinhibiting thrombus formation and for increasing the adhesiveness ofplatelets.

Therefore, they are useful in treatment and prevention of thromboses andmyocardial infarct, in treatment of atherosclerosis, and in general inall syndromes etiologically based on or associated with lipid imbalanceor hyperlipidemia, as well as in treatment of geriatric patients forprevention of cerebral ischemic episodes, and in long-term treatmentafter myocardial infarct.

When the compounds of the invention are given as anti-aggregatingagents, the routes of administration are the usual ones, oral,intravenous, subcutaneous, intramuscular. In emergency situations, thepreferred route is intravenous, with doses that can vary from 0.005 toabout 10 mg/kg/day. The exact dose will depend on the condition of thepatient, his weight, his age and the route of administration.

The compounds of the invention were also studied for their uterinecontractile activity, both in vitro and in vivo, against PGF₂α asstandard.

For example, in vitro, on the uterus of the estrogenized rat, compounds6αH-6,9α-oxide-16-m-chloro-phenoxy-ω-tetranor and6βH-6,9α-oxide-16-m-CF₃ -phenoxy-ω-tetranor, were 1.3 and 3.1 times asactive as PGF₂α. In the in vivo assay, measuring the intrauterinepressure of the ovariectomized rabbit, the same compounds were 5.9 and8.25 times as active as PGF₂α (see the following Table).

    ______________________________________                                                     in vitro                                                                      Uterus   Ileum   in vivo                                         ______________________________________                                        PGF.sub.2α                                                                             1          1       1                                           6αH--6,9α-oxide-16-m-                                             chloro-phenoxy-ω-te-                                                                   1.3        0.05    5.9                                         tranor                                                                        6βH--6,9α-oxide-16-m-                                              CF.sub.3 --phenoxy-ω-tetra-                                                            3.1        0.1     8.25                                        nor                                                                           ______________________________________                                    

The table shows that the compounds have greater activity on the uterusthan on the gastrointestinal tract.

These compounds, which are useful for induction of labor, for expulsionof dead fetuses from the pregnant female, in either human or veterinarymedicine, are without the undesirable side effects of the naturalprostaglandins, such as vomiting and diarrhea.

For this purpose the compounds of the invention can be given byintravenous infusion, at a dose of about 0.01 μg/kg/minute until the endof labor. At the same dosage, the compounds of the invention dilate theuterine cervix, facilitating therapeutic abortion and, in that situationare given preferably in the form of vaginal tablets or suppositories.

The compounds of the invention, in particular the compounddl-6βH-6,9α-oxide-16-m-chloro-phenoxy-ω-tetranor also have luteolyticactivity and are therefore of use for control of fertility.

The 6βH-6,9α-oxide and their 6αH-isomers were also investigated fortheir action on the gastrointestinal tract, in order to know: (a)cytoprotective activity against lesions induced by non-steroidanti-inflammatory drugs; (b) ability to prevent the ulcers induced bythe method of Togagi-Okabe[(Japan J. Pharmac. vol. 18, 9 (1968)] and (c)antisecretory activity, according to Shay et al Gastroenter. 26, 906(1954).

The cytoprotective ability is a common feature of all the compounds. Forexample, given subcutaneously, the 6βH-6,9α-oxide is slightly moreactive (1.5-2 times) than the standard PGE₂ as a gastric antisecretoryagent.

In general, the cytoprotective activity of the 6βH-compounds is doubledwhen an acetylene bond is present in the 13,14-position; it isquadrupled when a 16-alkyl group, usually a methyl, is positioned in the16(S)-configuration.

As an ulcer-preventing substance, the parent 6βH-6,9α-oxide analog is atleast equipotent with PGE₂ and the following substitutions,13,14-acetylene bond; 16S, or R methyl; 16S, or R fluoro, highlyincrease (up to 30 times) the potency ratio.

Furthermore, a significant oral antisecretory activity appears when amethyl group is in the C-15-position of the parent 6βH-6,9α-oxide or inthe 16,16-dimethyl compounds, such as the6βH-6,9α-oxide-16-methyl-16-butoxy-ω-tetranor derivative.

For this purpose the compounds are preferably given by intravenousinjection or infusion, subcutaneously or intramuscularly. Forintravenous infusion, the doses vary from about 0.1 μg to about 500μg/kg body weight/minute. The total daily dose, either by injection orby infusion, is of the order of 0.1 to 20 mg/kg, the exact dosedepending on the age, weight and condition of the patient or of theanimal being treated and on the route of administration.

In addition, the compounds are also useful for treatment of obstructivepulmonary diseases such as bronchial asthma, since they haveconsiderable bronchodilatory activity.

For treatment of the obstructive pulmonary disorders, for examplebronchial asthma, the compounds of the invention can be given bydifferent routes: orally in the form of tablets, capsules, coatedtablets or in liquid form as drops or syrups; rectally in suppositories;intravenously, intramuscularly or subcutaneously; by inhalation, asaerosols or solutions for the nebulizer; by insufflation, in powderedform.

Doses of the order of 0.01-4 mg/kg can be given from 1 to 4 times a day,with the exact dose depending on the age, weight, and condition of thepatient and on the route of administration. For use as an antiasthmatic,the compounds of the invention can be combined with other antiasthmaticagents, such as sympathicomimetic drugs like isoproterenol, ephedrine,etc., xanthine derivatives, such as theophylline and aminophylline, orcorticosteroids.

The dosages used as hypotensive and vasodilatory agents are about thesame as those used for the anti-aggregating effects.

As previously stated, the compounds of the invention can be given,either to humans or animals in a variety of dosage forms, e.g., orallyin the form of tablets, capsules or liquids; rectally, in the form ofsuppositories, parenterally, subcutaneously or intramuscularly, withintravenous administration being preferred in emergency situations; byinhalation in the form of aerosols or solutions for nebulizers; in theform of sterile implants for prolonged action; or intravaginally in theform, e.g., of bougies. The pharmaceutical or veterinary compositionscontaining the compounds of the invention may be prepared inconventional ways and contain conventional carriers and/or diluents.

For example, for intravenous injection or infusion, sterile aqueousisotonic solutions are preferred. For subcutaneous or intramuscularinjection, sterile solutions or suspensions in aqueous or non-aqueousmedia may be used; for tissue implants, a sterile tablet or siliconerubber capsule containing or impregnated with the compound is used.

Conventional carriers or diluents are, for example, water, gelatine,lactose, dextrose, saccharose, mannitol, sorbitol, cellulose, talc,stearic acid, calcium or magnesium stearate, glycol, starch, gum arabic,tragacanth gum, alginic acid or alginates, lecithin, polysorbate,vegetable oils, etc.

For administration by nebulizer, a suspension or a solution of thecompound of the invention, preferably in the form of a salt, such as thesodium salt in water, can be used. Alternatively, the pharmaceuticalpreparation can be in the form of a suspension or of a solution of thecompound of the invention in one of the usual liquefied propellants,such as dichlorodifluoromethane or dichlorotetrafluoroethane,administered from a pressurized container such as an aerosol bomb. Whenthe compound is not soluble in the propellant it may be necessary to adda co-solvent, such as ethanol, dipropylene glycol and/or a surfactant tothe pharmaceutical formulation.

The invention is illustrated by the following examples, wherein theabbreviations "THF", "DME", "DMSO", "THP", "Et₂ O" refer totetrahydrofuran, dimethoxyethane, dimethylsulphoxide, tetrahydropyranyl,and ethyl ether, respectively.

The following examples illustrate but do not limit the presentinvention.

EXAMPLE 1

To a solution of 1.0 g ofdl-5β-hydroxymethyl-2α,4α-dihydroxy-cyclopentan-1α-aceticacid-γ-lactone-4-p-phenyl benzoate in 8 ml benzene/DMSO (75/25) is addedwith stirring 0.89 g of dicyclohexylcarbodiimide. At room temperature,1.42 ml of a solution of pyridinium trifluoroacetate is added (preparedfrom 1 ml of trifluoroacetic acid and 2 ml of pyridine brought to 25 mlwith 75/25 benzene/DMSO). After 3 hours 19 ml of benzene is added andthe mixture is treated dropwise with an oxalic acid dihydrate solution,0.3 g in 3.8 ml of water. After approximately 15 minutes of stirring,the mixture is filtered, and the organic phase is washed with wateruntil neutral, concentrated to 2 ml, and then diluted with 5 ml ofisopropyl ether. The product is isolated by filtration and crystallizedfrom isopropyl ether to give 0.8 g ofdl-5β-formyl-2α,4α-dihydroxy-cyclopentan-1α-aceticacid-α-lactone-4-p-phenylbenzoate, m.p.=129°-131° C. A solution of 800mg of this in 2.8 ml of anhydrous methanol is treated with 0.62 ml ofmethyl orthoformate and 18 mg of p-toluenesulfonic acid monohydrate.After 1 hour, 0.01 ml of pyridine is added and the solution isevaporated to dryness. The residue is dissolved in ethyl acetate; it iswashed with 1.0 N NaOH and then saturated NaCl until neutral. Thesolvent is removed at reduced pressure and the residue is crystallizedfrom methanol to give 800 mg ofdl-5β-dimethoxymethyl-2α,4α-dihydroxy-cyclopentan-1.alpha.-aceticacid-γ-lactone-4-p-phenylbenzoate, m.p.=108°-110° C.

60 mg of K₂ CO₃ is added to a solution of this in 5.6 ml of anhydrousmethanol. After 4 hours of stirring at room temperature, the solution isfiltered; it is then reduced to small volume and acidified with asaturated NaH₂ PO₄ solution. The methanol is removed and the residuetaken up in ethyl acetate. This is washed with saturated NaCl untilneutral, is dried over anhydrous Na₂ SO₄, is filtered, and evaporatedunder reduced pressure to give 480 mg ofdl-5β-dimethoxymethyl-2α,4α-dihydroxy-cyclopentan-1.alpha.-aceticacid-γ-lactone.

A solution of this in 4 ml of CH₂ Cl₂ is treated with 0.32 ml of2,3-dihydropyran and 4.8 mg of p-toluenesulfonic acid. After 4 hours atroom temperature, pyridine is added and the solution is evaporated atreduced pressure. The crude reaction product is filtered on 5 g ofsilica gel, with cyclohexane:ethylether (50:50) as eluent, to give 380mg of dl-5β-dimethoxymethyl-2α,4α-dihydroxy-cyclopentan-1.alpha.-aceticacid-γ-lactone-4-tetrahydropyranyl ether. Starting from a 4-ester of5β-dimethoxymethyl-2α,4α-dihydroxy-cyclopentan-1α-acetic acid-γ-lactone(for example: 4-p-phenylbenzoate, m.p. 128°-130° C., [α]_(D) =-85°) orfrom a 4-ester of5α-hydroxymethyl-2β,4β-dihydroxy-cyclopentan-1β-acetic-γ-lactone (forexample: the 4-p-phenylbenzoate, m.p.=127°-129° C., [α]=+84.5°), thesame procedure was used to prepare the following compounds:5β-dimethoxymethyl-2α,4α -dihydroxy-cyclopentan-1α-aceticacid-γ-lactone-4-tetrahydropyranyl ether and5α-dimethoxymethyl-2β,4β-dihydroxy-cyclopentan-1β-aceticacid-γ-lactone-4-tetrahydropyranyl ether. If 1,4-diox-2-ene is usedinstead of 2,3-dihydropyran, the corresponding 4-dioxanyl etherderivatives are obtained.

EXAMPLE 2

A solution of 216 mg of5β-dimethoxymethyl-2α,4α-dihydroxy-cyclopentan-1α-acetic acid-γ-lactone[α]_(D) =-16°, [α]₃₆₅° =-48° (C=1.0 CHCl₃) in 1.6 ml ofdimethylformamide is treated with 0.3 ml of triethylamine followed by291 mg of dimethyl-tert-butylchlorosilane. After one hour, the mixtureis diluted with 8.3 ml of water and extracted with hexane. The organicphase is washed with water and dried over Na₂ SO₄ to give 310 mg of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-aceticacid-γ-lactone-4-dimethyl-tert-butylsilyl ether.

EXAMPLE 3

To a solution ofdl-5β-hydroxymethyl-2α,4α-dihydroxycyclopentan-1α-propanoicacid-δ-lactone-4p-phenylbenzoate (1 g) in 8 ml of benzene:DMSO (75:25)is added 0.86 g of dicyclohexyl carbodiimide followed by 1.37 ml of afreshly prepared pyridinium trifluoroacetate (see example 1). Afterthree hours, 18 ml of benzene is added; a solution of 0.29 g of oxalicacid dihydrate in 3.7 ml of water is then added dropwise. After 15minutes of stirring, the dicyclohexylurea is removed by filtration andthe organic phase is washed with water until neutral. This is thenreduced to volume to approximately 2 ml and isopropyl ether is added.One obtains 0.793 g ofdl-5β-formyl-2α,4α-dihydroxycyclopentan-1α-propionicacid-δ-lactone-4-p-phenylbenzoate.

A solution of 780 mg of this in 2.7 ml of anhydrous methanol is treatedwith 0.59 ml of methylorthoformate and 17.3 mg of p-toluenesulfonicacid. After approximately one hour, 0.01 ml of pyridine is added and thesolution is evaporated to dryness. The residue is taken up in ethylacetate; the organic phase is washed with 1 N NaOH and then saturatedNaCl until neutral. Evaporation to dryness gives 769 mg ofdl-5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propionicacid-δ-lactone-4p-phenylbenzoate. This is then dissolved in 5.4 ml ofanhydrous methanol and 75 mg of K₂ CO₃ is added. After four hours ofstirring at room temperature and filtration, the solution is reduced involume and acidified with a saturated solution of NaH₂ PO₄. The methanolis evaporated and the aqueous phase treated with ethyl acetate; theorganic phase is then washed with a saturated NaCl solution untilneutral, dried over Na₂ SO₄, and evaporated under vacuum to give crudedl-5β-dimethoxymethyl-2α ,4α-dihydroxycyclopentan-1α-propanoicacid-δ-lactone. A solution of this in 4 ml of CH₂ Cl₂ is treated with0.3 ml of 2,3-dihydropyran and 4.5 mg of p-toluenesulfonic acid. Afterfour hours at room temperature, 0.01 ml of pyridine is added and thesolution is evaporated to dryness. The reaction product is purified onsilica gel with cyclohexane: ethyl ether (50:50) as eluent to give 480mg of dl-5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propanoicacid-δ-lactone-4-tetrahydropyranyl ether.

From a 4-ester of 5β-hydroxymethyl-2α,4α-dihydroxycyclopentan-τα-propanoic acid-δ-lactone and from a 4-ester of5α-hydroxymethyl-2β,4β-dihydroxycyclopentan-1β-propanoic acid-δ-lactone(for example, the 4-p-phenylbenzoate), using the same procedure, thefollowing compounds were obtained:

5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propanoicacid-δ-lactone-4-tetrahydropyranyl ether;

5α-dimethoxymethyl-2β,4β-dihydroxycyclopentan-1β-propanoicacid-δ-lactone-4-tetrahydropyranyl ether.

If 1,4-diox-2-ene is used instead of 2,3-dihydropyran, the corresponding4-dioxanyl ether derivatives are obtained.

EXAMPLE 4

A solution of 1 g of 5β-formyl-2α-hydroxycyclopentan-1α-aceticacid-γ-lactone in 6.5 ml of anhydrous methanol is treated with 1.74 mlof methylorthoformate and 52 mg of p-toluenesulfonic acid. Afterapproximately one hour, 0.04 ml of pyridine is added and the solution isevaporated to dryness. The residue is taken up in ethyl acetate, and thewashed with 1 N NaOH and then saturated NaCl until netural. Evaporationunder vacuum gives 1 g of5β-dimethoxymethyl-2α-hydroxycyclopentan-1α-acetic acid-δ-lactone,[α]=-16°.

The same procedure gave5β-dimethoxymethyl-2α-hydroxycyclopentan-1α-propionic acid-δ-lactone andits dl derivatives from 5β-formyl-2α-hydroxycyclopentan-1α-propionicacid-δ-lactone.

EXAMPLE 5

To a solution of 960 mg ofdl-5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-aceticacid-γ-lactone-4-tetrahydropyranyl ether in 16 ml of toluene, cooled to-70° C., is added 8.5 ml of a 0.5 N toluene solution ofdi-iso-butylaluminum hydride, over a 30 minute period. After a further30 minutes of stirring at -70° C., 10 ml of a 2 M toluene solution ofisopropanol is added dropwise. The solution is warmed to 0° C. andtreated with 3 ml of a 30% solution of NaH₂ PO₄. After 1 hour ofstirring, 12 g of anhydrous Na₂ SO₄ is added. Filtration and evaporationof solvent gives 900 mg ofdl-5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-ethanal-γ-lactol-4-tetrahydropyranylether.

EXAMPLE 6

Following the procedure of example 5, a solution of 400 mg of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-aceticacid-γ-lactone-4-dimethyl-tert-butylsilyl ether in 11 ml of toluene,cooled to -70° C., is treated dropwise with 5.9 ml of a 0.5 N toluenesolution of di-iso-butylaluminum hydride to give 0.43 g of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-ethanal-γ-lactol-4-dimethyl-tert-butylsilylether.

EXAMPLE 7

Under a nitrogen atmosphere, a solution of 628 mg of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propanoicacid-δ-lactone-4tetrahydropyranyl ether in 11 ml of toluene, cooled to-70° C., is treated dropwise with 5.9 ml of a 0.5 M toluene solution ofdi-iso-butylaluminum hydride. After 30 minutes at -70° C., 10.9 ml of a2 M toluene solution of isopropanol is added dropwise. The temperatureis allowed to rise to 0° C. and 2 ml of 30% NaH₂ PO₄ is added. After onehour of stirring, 8.3 g of anhydrous Na₂ SO₄ is added and the mixture isfiltered. Evaporation of the organic phase under vacuum gives 620 mg of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propanal-δ-lactol-4-tetrahydropyranylether.

EXAMPLE 8

Using one of the procedures outlined in examples 5, 6 and 7, a 4-acetal(4-tetrahydropyranyl ether; 4-dioxanyl ether) and a 4-dimethylbutylsilylether of the following compounds are prepared:

5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-ethanal-γ-lactol, inits dl and optically active form (or nat-);

5α-dimethoxymethyl-2β,4β-dihydroxycyclopentan-1β-ethanal-γ-lactol (orent- form);

5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propanal-δ-lactol, inits dl and optically active form (or nat-);

5α-dimethoxymethyl-2β,4β-dihydroxycyclopentan-1β-propanal-δ-lactol (orent- form).

EXAMPLE 9

0.29 ml of absolute ethanol in 3.5 ml of toluene is added dropwise to asolution of 5×10⁻³ mol of sodium (2-methoxyethoxy)aluminum hydride (1.4ml of a 70% benzene solution diluted with 5 ml of toluene) cooled to 0°C. 8.2 ml of the alanate solution so prepared is added, at -30° C., to0.98 g of dl-5β-benzyloxymethyl-2α-hydroxycyclopentan-1α-propionicacid-δ-lactone in 22 ml of toluene. After 45 minutes, excess reagent isquenched with 6 ml of a 0.5 M toluene solution of isopropanol. Themixture is warmed to 0° C., 4 ml of 30% NaH₂ PO₄ is added, and theresulting mixture is stirred for 2 hours. The inorganic salts areremoved by filtration and the solution is evaporated to dryness to give0.94 g ofdl-5β-benzyloxymethyl-2α-hydroxycyclopentan-1α-propanal-.delta.-lactol.

Using the procedure reported above, or one of those from examples 4 to7, the following compounds were prepared from their correspondingγ-lactones:

5β-benzyloxymethyl-2α-hydroxycyclopentan-1α-ethanal-.gamma.-lactol;

5β-benzyloxymethyl-2α-hydroxycyclopentan-1α-propanal-.delta.-lactol;

5β-dimethoxymethyl-2α-hydroxycyclopentan-1α-ethanal-.gamma.-lactol;

5β-dimethoxymethyl-2α-hydroxycyclopentan-1α-propanal-.delta.lactol.

EXAMPLE 10

With stirring and external cooling to maintain a reaction temperature of20°-22° C., a solution of 1.05 g of potassium tert-butylate in 10 ml ofDMSO is added dropwise to a solution of 1.8 g of4-carboxybutyl-triphenylphosphonium bromide and 0.38 g of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-ethanal-γ-lactol-4-tetrahydropyranylether. After the addition, the mixture is held at room temperature for 1hour and then diluted with 16 ml of ice/water. The aqueous phase isextracted with ether (5×8 ml) and ether:benzene (70:30, 5×6 ml); theorganic layers, after re-extraction with 0.5 M NaOH (2×10 ml), arediscarded. The combined alkaline aqueous phase is acidified to pH 4.8with 30% NaH₂ PO₄ and then extracted with ethyl ether:pentane (1:1,5×15ml); from the combined organic phases, after drying over Na₂ SO₄ andsolvent removal, one obtains 0.45 g of5-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethylcyclopentan-1'α-yl)-hept-5-enoicacid-4'-tetrahydropyranyl ether. This in turn is converted to thecorresponding methyl ester upon treatment with diazomethane in ether. Ananalytic sample is prepared by adsorbing 100 mg of the crude product on1 g of silica gel and eluting with benzene:ethyl ether (85:15). N.M.R.##STR41## 5.46 p.p.m. multiplet.

EXAMPLE 11

In an anhydrous nitrogen atmosphere, a suspension of 0.39 g of a 75% oildispersion of NaH in DMSO (13.5 ml) is heated to 60°-65° C. for 31/2hours; after cooling to room temperature and while maintaining thereaction mixture at 20°-22° C., the following are added, in order: 2.66g of 3-carboxypropyltriphenylphosphonium bromide in 6 ml of DMSO and 0.6g of5β-dimethoxymethyl-2α,4α-dihydroxycyclopentan-1α-propanal-δ-lactol-4-tetrahydropyranylether in 3 ml of DMSO. The mixture is stirred for 3 hours, and thendiluted with 35 ml of water. the aqueous phase is extracted with ethylether (5×12 ml) and ethyl ether:benzene (70:30, 7×12 ml); the combinedorganic extract, after re-extraction with 0.5 N NaOH (2×15 ml), isdiscarded. The combined alkaline aqueous extract is acidified to pH 4.3with 30% aqueous NaH₂ PO₄ and extracted with ethyl ether:pentane (1:1)to give, after washing until neutral, drying over Na₂ SO₄, and removalof the solvent, 0.71 g of4-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-4-enoicacid. Treatment with diazomethane affords the corresponding methylester.

EXAMPLE 12

The methyl ester of the following acids were prepared from lactols madeaccording to the procedures in examples 4 to 8 treatment with a Wittigreagent (prepared from 4-carboxybutyl-triphenylphosphonium bromide or3-carboxypropyltriphenylphosphonium bromide) and successiveesterification with diazomethane, in their optically active or dl forms:

4-cis-7-(2'α-hydroxy-5'β-benzyloxymethylcyclopent-1'α-yl)-hept-4-enoic;

4-cis-7-(2'α-hydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-4-enoic;

5-cis-7-(2'α-hydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-5-enoic;

5-cis-7-(2'α-hydroxy-5'β-benzyloxymethyl-cyclopent-1'α-yl)-hept-5-enoic;

5-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-5-enoicand its 4'-dioxanyl, tetrahydropyranil anddimethyl-tert-butylsilyl)-ethers;

4-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-4-enoicand its 4'-(dioxanyl, tetrahydropyranyl anddimethyl-tert-butylsilyl)-ethers;

4-cis-6-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hex-4-enoicand its 4'-(tetrahydropyranylether;

5-cis-8-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-oct-5-enoicand its 4'-tetrahydropyranylether.

EXAMPLE 13

A solution of 1.06 g of the methyl ester of5-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid-4'-tetrahydropyranyl ether in 5 ml of methanol is added to 0.84 gof mercuric acetate in methanol. After 30 minutes at room temperature, asolution of 250 mg of sodium borohydride in 2 ml of water is added withstirring and external cooling. After 20 minutes of stirring, the mixtureis acidified to pH 6.5 with aqueous monosodium phosphate, the methanolis removed under vacuum, and the residue is taken up in water/ethylether. The organic phase, upon removal of the solvent, affords 1.02 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether.

EXAMPLE 14

A solution of 1.59 g of4-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-4-enoicmethyl ester-4'-tetrahydropyranyl ether in 6 ml of THF is added to asolution of 1.26 g of mercuric acetate in 4 ml of water diluted with 4ml of THF. The mixture is stirred for 11/2 hours until precipitation iscomplete. 180 mg of sodium borohydride (in 2.5 ml of water) is thenadded and the resulting mixture is stirred for 30 minutes. The solutionis decanted from the precipitate, which is then washed with THF. Theaqueous/organic decanted solution is concentrated under reduced pressureand the residue extracted with ethyl acetate. The combined organicextract, after washing with water until neutral, affords upon removal ofthe solvent 0.98 g of4-(7'-exodimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester-8'-tetrahydropyranyl ether.

EXAMPLE 15

Starting from the esters prepared as described in examples 9 to 11, byreaction with a mercuric salt and subsequent reductive demercuration asdescribed in the procedures in examples 13 and 14, the followingbicyclic derivatives are obtained:

5-(6'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3' -yl)pentanoicacid methyl ester;

5-(6'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.3.0]octan-3' -yl)pentanoicacid methyl ester;

4-(7'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3' -yl)butanoicacid methyl ester;

4-(7'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3' -yl)butanoicacid methyl ester;

a 7'-acetal ether (tetrahydropyranyl ether, dioxanyl ether), and a7'-dimethyl-tert-butylsilyl ether of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)pentanoic acid methyl ester;

an 8'-acetal ether (tetrahydropyranyl ether, dioxanyl ether) and an8'-dimethyl-tert-butylsilyl ether of4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)butanoic acid methyl ester;

4-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-butanoic acid methyl ester-7'-tetrahydropyranyl ether;

5-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-pentanoic acid methyl ester-8'-tetrahydropyranyl ether.

All these compounds are obtained in the d,l-, nat- and ent-forms.

EXAMPLE 16

A solution of 0.48 g of bromine in 5 ml of methylene chloride is addeddropwise, with stirring, to a solution of 0.27 g of pyridine and 1.2 gof5-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid methyl ester-4'-tetrahydropyranyl ether in 6 ml of methylenechloride, cooled to 0° C. Stirring is continued for ten minutesfollowing the addition. The organic phase is washed with 5 ml of a pH 7buffer solution 10% in sodium thio sulfate and then with water untilneutral. After drying over Na₂ SO₄, removal of the solvent affords 1.38g of5-bromo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether.

EXAMPLE 17

1.24 g of N-iodosuccinimide is added to a solution of 2 g of5-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid methyl ester-4'-tetrahydropyranyl ether in 15 ml of carbontetrachloride. The mixture is stirred for 3 hours and 30 ml of ethylether is added. The organic phase is washed with 1 N Na₂ S₂ O₃ and thenwith water until neutral. Removal of the solvent affords 2.48 g of5-iodo-5'-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester-7'-tetrahydropyranyl ether.

EXAMPLE 18

422 mg of N-bromosuccinimide is added with stirring to a solution of0.78 g of4-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-4-enoicacid methyl ester-4-tetrahydropyranyl ether in 11 ml of CCl₄. After fourhours of stirring, ethyl ether is added; the solution is then washedwith water, 1 N Na₂ S₂ O₃, and water until neutral. Evaporation todryness gives 0.98 g of4-bromo-4-(7'-exodimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoicacid methyl ester-8'-tetrahydropyranyl ether.

EXAMPLE 19

To a suspension of 0.25 g of dry CaCO₃ in a solution of 346 mg of5-cis-7-(2'α-hydroxy-5'β-benzyloxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid methyl ester in 10 ml of CCl₄ cooled to 0°-5° C. is added withstirring a solution of 75 mg of chlorine in 3 ml of CCl₄. After stirringfor 2 hours, the inorganic salts are removed by filtration. The solutionis washed with a 7% aqueous solution of KI and Na₂ S₂ O₃ and then withwater until neutral. The residue upon evaporation to dryness is adsorbedon silica gel and eluted with cyclohexane:ethyl ether (80:20) to give0.27 g of5-chloro-5-(6'-exo-benzyloxymethyl-2'-oxabicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester.

EXAMPLE 20

A solution of 0.39 g of5-cis-7-(2'α,4'α-dihydroxy-5'β-dimethoxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid methyl ester-4'-dioxanyl ether and 98 mg of pyridine in 10 ml ofdichloromethane is cooled to -40° C. A solution of 81 mg of chlorine in6 ml of CH₂ Cl₂ is then added over a period of 30 minutes. After 10minutes of stirring, the mixture is heated to room temperature. Theorganic phase is washed with a 7% solution of KI and Na₂ S₂ O₃ and thenwith water until neutral. Removal of the solvent affords 0.39 g of5-chloro-5-(6'-exodimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-4'-dioxanyl ether.

EXAMPLE 21

280 mg of iodine in CCl₄ is added to a solution of 0.39 g of4-cis-7-(2'α,4'α-dihydroxy-5β-dimethoxymethyl-cyclopent-1'α-yl)-hept-4-enoicacid methyl ester-4'-tetrahydropyranyl ether and 82 mg of pyridine in 10ml of CCl₄. Stirring is continued until the color disappears; 30 ml ofethyl ether is then added. The organic phase is washed with water, thena solution 7% inKI and Na₂ S₂ O₃, and then water until neutral. Removalof the solvent affords 0.48 g of4-iodo-4-(7'-exodimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester-8'-tetrahydropyranyl ether.

EXAMPLE 22

To a solution of 0.34 g of5-cis-7-(2'α-hydroxy-5'β-benzyloxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid methyl ester in 6 ml of methanol is added with stirring a solutionof 0.325 g of mercuric acetate in water:methanol (1:9,6 ml). The mixtureis stirred for 15 minutes, reduced to 3 ml under vacuum, and then addedto 5 ml of a saturated solution of NaCl in water. The precipitate isthen extracted with methylene chloride. The organic phase is washed withwater and evaporated to dryness to give 0.52 g of crude5-chloromercurio-5-(6'-exobenzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester. A solution of this in methylenechloride (10 ml) is treated with 80 mg of pyridine in 2 ml of CH₂ Cl₂and then dropwise with stirring with a solution of 150 mg of Br₂ in CH₂Cl₂. After 20 minutes of stirring at room temperature, the organic phaseis washed with water, then 7% KI and Na₂ S₂ O₃, and water until neutral.Evaporation to dryness gives 0.34 g of5-bromo-5-(6'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester.

Mass spectrum M⁺ 424,426 m/e M³⁰ -HBr 344 m/e M⁺ -CHBr (CH₂)₃ CO₂ CH₃=231 m/e.

EXAMPLE 23

10.5 mg of p-toluenesulfonic acid monohydrate is added to a solution of0.26 g of5-iodo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether and theresulting mixture is left ar room temperature for 30 minutes. 10 mg ofpyridine is then added and the solution is evaporated to dryness. Theresidue is taken up in ethyl ether/water. After drying over Na₂ SO₄, theorganic phase gives upon solvent evaporation 0.23 g of crude5-iodo-5-(6'exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester. Separation by chromatography on silicagel with methylene chloride:ethyl ether (75:25) as eluent affords 84 mgof5-iodo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-endo-yl)-pentanoicacid methyl ester and 55 mg of the 3'-exo isomer.

Referring the spectrometric data, the prostaglandin numbering will beused; thus the above diastereoisomers can be named as follows: the endodiastereoisomer:6βH-6,9α-oxide-11α-hydroxy-12β-dimethoxy-formylacetal-ω(20→13)tetranor-prostanoicacid methyl ester and the exo diastereoisomer6αH-6,9α-oxide-11α-hydroxy-12β-dimethoxy-formylacetal-ω(20→13)tetranor-prostanoicacid methyl ester.

Analytical data:

endo diastereoisomer: TLC more polar-one spot.

Mass spectrum (m/e; % intensity fragment): 442 0.002 M⁺ ; 412 4 M⁺ -CH₂O, 315/314 3 M⁺ -iodine/Hl 283 11 315-CH₃ OH, 75 100 ##STR42##

N.M.R. (solvent CDCl₃, TMS internal standard) p.p.m.: 3.49 and 3.52 s,3H/3H, ##STR43## 3.64 s,3H,CO₂ CH₃ ; 4.00 m, 3H (protons at C₅, C₉,C₁₁); 4.29 d,1H, ##STR44## 4.60 m, 1H, 6βH.

¹³ C-MR (at 20 MHz in C₆ D₆ solution TMS int. standard) p.p.m. 172.9,36.5, 33.1, 25.6, 41.8, 81.0, 38.1, 55.5, 83.1, 41.5, 74.2, 44.6, 108.0,54.2, 54.1, 51.0.

exo diastereoisomer: TLC less polar-one spot.

Mass spectrum: 442 0.01 M⁺, 366 3 M⁺ CH₂ CH(OCH₃)₂, 315 4 M⁺ -l; 283 10M⁺ -l-CH₃ OH; 75 100 CH(OCH₃)₂ ⁺

N.M.R.: p.p.m. 3.34 and 3.37 3H/3H s ##STR45## 3.5 and 4.1 m 1H and 2Hprotons at C₅,C₉,C₁₁ uncertain assignment, 3.65, s3H, CO₂ CH₃ ; 4.21,d1H, ##STR46## 4.35 m, 1H,6αH ¹³ CMR; p.p.m. 173.0, 37.0, 33.1, 25.5,40.1, 84.4, 39.7, 57.2, 83.7, 40.5, 75.9, 44.0, 107.3, 54.0, 53.8, 51.1.

EXAMPLE 24

A solution of 980 mg of4-bromo-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)butanoic acid methyl ester-8'-tetrahydropyranyl ether in 6 ml ofanhydrous methanol is treated at room temperature for 30 minutes with 48mg of p-toluenesulfonic acid. 2% aqueous NaHCO₃ is added and the mixtureis extracted with ethyl ether. From the organic phase, after washinguntil neutral and evaporation of the solvent, one obtains 0.68 g of acrude product which after purification on silica gel with methylenechloride: ethyl ether (80:20) as eluent affords 0.30 g of4-bromo-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-exo-yl)-butanoicacid methyl ester and 0.29 g of the 3'-endo isomer.

EXAMPLE 25

Starting from acids prepared according to the procedure of example 11and performing their halocyclization as described in one of the examples16 to 22, the following halobicyclic compounds are prepared:

5-chloro-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether (and7'-dioxanyl ether and 7'-dimethylbutylsilyl ether);

4-chloro-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester-8'-tetrahydropyranyl ether (and8'-dioxanyl and 8'-dimethylbutylsilyl ethers);

5-chloro-5-(6'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester;

5-chloro-5-(6'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester;

4-chloro-4-(7'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester;

4-chloro-4-(7'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester;

5-bromo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether (and7'-dioxanyl and 7'-dimethylbutylsilyl ethers);

4-bromo-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester-8'-tetrahydropyranyl ether (and8'-dioxanyl and 8'-dimethylbutylsilyl ethers);

5-bromo-5-(6'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester;

5-bromo-5-(6'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester;

4-bromo-4-(7'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester;

4-bromo-4-(7'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid-methyl ester;

5-iodo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxu-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether (and7'-dioxanyl and 7'-dimethylbutylsilyl ethers);

4-iodo-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester-8'-tetrahydropyranyl ether (and8'-dioxanyl and 8'-dimethylbutylsilyl ethers);

5-iodo-5-(6'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester;

5-iodo-5-(6'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester;

4-iodo-4-(7'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester;

4-iodo-4-(7'-exo-dimethoxymethyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester.

EXAMPLE 26

Selective de-acetalization or de-silylization of the ethers described inexample 25, according to the procedure in examples 23 and 24 affords the3' -oxiran-hydroxide-formyl acetales derivatives, which give thefollowing upon separation of isomers:

5-chloro-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester, and its individual 3'-exo and 3'-endoisomers;

4-chloro-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester, and its individual 3'-exo and 3'-endoisomers;

5-bromo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester, and its individual 3'-exo and 3'-endoisomers;

endo isomer: TLC on SiO₂ more polar one spot.

N.M.R.: (CDCl₃) p.p.m. 3.4 d,6H, ##STR47## 3.65, s,3H CO₂ CH₃ 4.00 m,4H(protons at C₄,C₅,C₉,C₁₁); 4.17 d,1, ##STR48## 4.5 m,1H, 6βH.

¹³ CMR: 173.0,35.0, 33.3, 23.6, 59.4, 80.6, 36.4, 55.6, 83.3, 41.6,74.3, 44.5, 108.0, 54.4, 54.2, 51.1.

exo isomer: TLC on SiO₂ less polar isomer one spot. N.M.R.: (CDCl₃)p.p.m.: 3.37 d, ##STR49## 3.66 s,3H,CO₂ CH₃ 4.00 m,4H, protons atC₄,C₅,C₉,C₁₁ ; 4.2 d,1, ##STR50## 4.32 m,1H, 6αH.

¹³ CMR: 173.0, 35.5, 33.3, 23.6, 57.7, 84.2, 38.2, 57.9, 83.6, 40.5,76.0, 43.9, 107.2, 53.8, 53.8, 51.0.

4-bromo-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester and its individual isomers, 3'-exo and3'-endo;

5-iodo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester and its individual 3'-exo and 3'-endoisomers;

4-iodo-4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester and its individual 3'-exo and 3'-endoisomers.

EXAMPLE 27

With stirring under nitrogen, a benzene solution (30 ml) of 2.8 g of5-iodo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether is treatedwith a solution of 2.8 g of tributyltin hydride in 8 ml of benzene. Themixture is held at 55° C. for 8 hours and then overnight at roomtemperature. The benzene layer is washed with 2×10 ml of a 5% NaHCO₃solution and then with water until neutral. The residue upon solventevaporation is adsorbed on 10 g of silica gel and eluted with benzeneand benzene:ethyl ether (85:15) to give 1.94 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether.

EXAMPLE 28

60 mg of p-toluenesulfonic acid is added to a solution of 1.98 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether in 10 ml ofanhydrous methanol. After 30 minutes at room temperature, this is addedto 20 ml of 20% aqueous NaHCO₃. The mixture is extracted with ethylether; the combined ether extract, after drying over Na₂ SO₄, isevaporated to dryness. The residue is adsorbed on 100 g of silica geland eluted with methylene chloride:ethyl ether (94:6) to give 0.64 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid methyl ester, 0.52 g of the 3'-endo isomer and 0.12 g of the 3'-yl.

N.M.R. (CDCl₃) endo isomer 4.6 p.p.m. m,1H 6βH, T.L.C. more polar; exoisomer 4.3 p.p.m. m,1H 6αH, T.L.C. less polar.

0.32 g of the 3'-endo isomer is dissolved in pyridine (0.8 ml) andtreated for 8 hours at room temperature with 0.3 ml of acetic anhydride.The mixture is then poured into ice/water, and, after acidifying to pH4.2, is extracted with ethyl ether. The combined extract, after washinguntil neutral, is evaporated to give 0.315 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid methyl ester-7'-acetate.

EXAMPLE 29

A solution of 1.32 g of4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester-8'-tert-butylmethylsilyl ether in 10 mlof anhydrous methanol is treated with 55 mg of p-toluenesulfonic acidfor 2 hours at room temperature. 0.1 ml of pyridine is added, thesolvent is removed under vacuum, and the residue is taken up inwater/ethyl ether. The organic phase gives, upon removal of the solvent,1.1 g of the crude 8'-hydroxy-3' -yl derivative. Chromatography of thison silica gel with benzene:ethyl ether (80:20) as eluent separates thisinto4-(7'-exo-dimethoxymethyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-endo-yl)-butanoicacid methyl ester (0.42 g) and the 3'-exo-yl isomer (0.34 g).

EXAMPLE 30

Using the procedure in examples 28 and 29, methanolysis of the ethers(acetal or silyl) described in example 15 gives the corresponding freealcohols.

EXAMPLE 31

Upon acetylation with pyridine (0.6 ml) and acetic anhydride (0.3 ml)0.2 g of5-iodo-5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-endo-yl)-pentanoicacid methyl ester gives 0.21 g of the corresponding 7'-acetoxyderivative.

N.M.R. (CDCl₃) p.p.m.:2.03 s,3H OCOCH₃ ; 3.36-3.40 s,s 3H/3H ##STR51##3.66 s 3H CO₂ CH₃ ; 4.00 m 2H protons at C₅,C₉ ; 4.27 d 1H ##STR52## 4.6m 1H 6βH 5.0 m 1H proton at C₁₁. [The spectrometric data for the 6αHisomer acetate are respectively the following 2.03; 3.34-338, 3.66 s+m4H CO₂ CH₃ and one of C₅,C₉ protons 4.1 m 1H other of C₅,C₉ protons 4.2,4.4 m 1H 6αH, 5.1]. A solution of the 5-iodo-3'-endo-acetate in benzene(5 ml) is treated with 0.4 g of tributyltin hydride for 10 hours at 50°C. After the benzene phase is washed with 5% NaHCO₃ and water,evaporation of the solvent and purification on silica gel (10 g) with abenzene:ethyl ether (80:20) eluent afford 0.105 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-endo-yl)-pentanoicacid methyl ester-7'-acetate, identical in all respects with a sampleprepared by the procedure in example 28.

EXAMPLE 32

Using the procedure of examples 27 and 31, the reduction withtributyltin hydride of one of the halo-derivatives synthesized inexamples 16-26 gives the corresponding derivative in which halogen isreplaced by hydrogen. These are identical in every way with thecompounds prepared according to the procedures of examples 15, 28, 29and 30.

EXAMPLE 33

5.4 mg of hydroquinone and a solution of 1.63 g of oxalic acid in 48 mlof water are added to a solution of 4 g of5-(6'-exo-dimethoxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester in 180 ml of acetone. After 12 hours at40° C., the acetone is removed at reduced pressure and the mixture isextracted with ethyl acetate (3×25 ml). The combined organic extract iswashed until neutral with a 10% ammonium sulfate solution and dried overNa₂ SO₄. Removal of the solvent affords 3.21 g of5-(6'-exoformyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)pentanoic acid methyl ester. The 6'-exo-formyl-3'-endo and the6'-exo-formyl-3'-exo derivatives are prepared from the correspondingindividual isomers.

EXAMPLE 34

Using the procedure of example 33, starting from the correspondingbicyclo[3.3.0]octan-6'-exo-dimethoxymethyl andbicyclo[3.4.0]nonan-7'-exo-dimethoxymethyl derivatives, the followingcompounds are prepared, either as individual 3'-exo and 3'-endo or 3'isomers:

5-(6'-exo-formyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methylester;

4-(7'-exo-formyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methylester;

5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester;

4-(7'-exo-formyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoicacid methyl ester;

5-chloro-5-(6'-exo-formyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester;

4-chloro-4-(7'-exo-formyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoicacid methyl ester;

5-chloro-5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester;

4-chloro-4-(7'-exo-formyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoicacid methyl ester;

5-bromo-5-(6'-exo-formyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester;

4-bromo-4-(7'-exo-formyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acidmethyl ester;

5-bromo-5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester;

4-bromo-4-(7'-exo-formyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoicacid methyl ester;

5-iodo-5-(6'-exo-formyl-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acidmethyl ester;

4-iodo-4-(7'-exo-formyl-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acidmethyl ester;

5-iodo-5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester;

4-iodo-4-(7'-exo-dormyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoicacid methyl ester;

5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester-7'-acetate;

5-iodo-5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl-pentanoicacid methyl ester-7'-acetate;

5-(7'-exo-formyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-pentanoicacid methyl ester;

4-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-butanoicacid methyl ester.

EXAMPLE 35

To a solution of 1.2 g of5-(6'-exo-benzyloxymethyl-2'-oxa-bicyclo[3.3.0]octan-3' -yl)-pentanoicacid methyl ester in methanol:methyl acetate (10 ml:10 ml) is added 2 mlof a 0;1 N methanol solution of HCl. After 0.15 g of PtO₂ is added, themixture is hydrogenated at ambient temperature and pressure until 1molar equivalent of hydrogen is absorbed. After the removal of the gasunder vacuum and washing with nitrogen, the suspension is filtered,neutralized, and evaporated to dryness. The residue is taken up inwater/ethyl acetate, and the organic phase yields 0.84 g of5-(6'-exo-hydroxymethyl-2'-oxa-bicyclo[3.3.0]octan-3' -yl)-pentanoicacid methyl ester. This is then oxidized to the 6'-exo-formyl derivativeby the procedure in example 1, using dicyclohexylcarbodiimide inDMSO:benzene (25:75).

EXAMPLE 36

To a solution of 18.1 g of5β-tetrahydropyranyloxymethyl-2α,4α-dihydroxy-cyclopent-1α-aceticacid-γ-lactone-4-tetrahydropyranyl ether in 150 ml of toluene cooled to-70° C. is added in 30 minutes 128 ml of a 5 M solution ofdi-iso-butylaluminum hydride (1.2 M/M). After 30 minutes at -70° C., 128ml of a 2 M toluene solution of isopropanol is added and the solution isbrought to 0° C. Then 10 ml of a saturated aqueous solution of NaH₂ PO₄is added and the mixture is stirred for four hours. Following theaddition of 10 g of anhydrous Na₂ SO₄ and 10 g of filtering earth, thesolution is filtered and evaporated to dryness to give 18.1 g of5β-tetrahydropyranyloxymethyl-2α,4α-dihydroxy-cyclopent-1α-ethanal-γ-lactol-4-tetrahydropyranylether. A solution of this in 24 ml of anhydrous DMSO is added dropwiseto a solution of the ylide prepared as follows: 9.6 g of 80% sodiumhydride in 300 ml of DMSO is heated for four hours at 60° C. Then afterthe mixture is brought to 18°-20° C., 67 g of 4-carboxybutyltriphenylphosphonium bromide dissolved in 80 ml of anhydrous DMSO is added whilemaintaining a temperature of 20°-22° C. to generate a bright red color.After four hours of stirring, 600 ml of water is added and the mixtureis extracted with ethyl ether:benzene (70:30) to remove thetriphenylphosphine oxide. The benzene organic phase is re-extracted with0.1 N NaOH and then with water until neutral; it is then discarded. Thealkaline aqueous phase is acidified to pH 5-4.8 and then extracted withethyl ether:pentane (1:1) to give 21.6 g of5-cis-7-(2'α,4'α-dihydroxy-5'β-tetrahydropyranyloxymethyl-cyclopent-1α-yl)-hept-5-enoicacid-4'-tetrahydropyranyl ether, which may be converted to its methylester by treatment with diazomethane in ether. 7.72 g of this ester in28 ml of tetrahydrofuran is added dropwise to a yellow-brown suspensionformed by adding 28 ml of THF to a solution of 6.13 g of mercuricacetate in 28 ml of water. After the mixture is stirred for 20 minutesat room temperature, it is cooled in an ice:water bath and 810 mg ofNaBH₄ in 14 ml of water is added dropwise. Elemental mercuryprecipitates out, the suspension is decanted, the tetrahydrofuran isevaporated at reduced pressure and the residue is extracted with ethylether. Removal of the solvent affords 7.5 g of5-(6'-exo-tetrahydropyranyloxymethyl-7'-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester-7'-tetrahydropyranyl ether; 0.42 g ofp-toluenesulfonic acid is then added to a solution of this in 30 ml ofmethanol. After 2 hours at room temperature, the solution isconcentrated under vacuum and water is added. After extraction withether and chromatography on silica gel with ethyl ether as eluent, oneobtains 2.4 g of5-(6'-exo-hydroxymethyl-7'-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid methyl ester and 2.6 g of the 3'-endo isomer.

EXAMPLE 37

2.5 g of N-iodosuccinimide is added to a solution of 4.26 g of5-cis-7-(2'α,4'α-dihydroxy-5'β-tetrahydropyranyloxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid-4'-tetrahydropyranyl ether in CH₂ Cl₂ :CCl₄ (10 ml:10 ml) and theresulting mixture is stirred for four hours. 30 ml of anhydrous methanolcontaining 130 mg of p-toluenesulfonic acid is added and stirring iscontinued for another 2 hours. 0.2 ml of pyridine is added, the mixtureis reduced to small volume, and the residue is taken up in water/ethylacetate. After washing with Na₂ S₂ O₃ and then water until neutral, theorganic phase is evaporated to dryness to give a residue that isadsorbed on silica gel and eluted with ethyl ether to give 2.2 g of5-iodo-5-(6'-exohydroxymethyl-7'-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid methyl ester and 1.85 g of the 3'-endo isomer.

EXAMPLE 38

Following the procedure of example 37, but using the methyl esterinstead of the acid and N-bromoacetamide instead of N-iodosuccinimide,the5-bromo-5-(6'-exo-hydroxymethyl-7'-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoicacid methyl ester is prepared. Silica gel chromatography allows theseparation into the 3'-exo and 3'-endo isomers.

EXAMPLE 39

A solution of 0.86 g of pyridine and 2.2 g of5-cis-7-(2'α,4'α-dihydroxy-5'β-tetrahydropyranyloxymethyl-cyclopent-1'α-yl)-hept-5-enoicacid methyl ester-4'-tetrahydropyranyl ether in dichloromethane (20 ml)is cooled to -30° C. and 0.38 g of chlorine in 10 ml of CCl₄ :CH₂ Cl₂(1:1) is added. The mixture is stirred for 2 hours, warmed to roomtemperature, and washed with 2N H₂ SO₄ and then water until neutral.After evaporation of the solvent, the residue is dissolved in methanol(10 ml) and treated with 0.1 g of p-toluenesulfonic acid. The solutionis then concentrated, diluted with water, and extracted with ethylacetate. Removal of the solvent and purification of the residue onsilica gel afford 0.6 g of5-chloro-5-(6'-exo-hydroxymethyl-7'-endo-hydroxy-2'-oxabicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid and 0.71 g of the 3'-endo isomer.

EXAMPLE 40

To a solution of 0.356 g of5-iodo-5-(6'-exo-hydroxymethyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid methyl ester in 4.8 ml of benzene:DMSO (75:25) are added, in order,0.28 g of dicyclohexylcarbodiimide and 0.4 ml of a pyridiniumtrifluoroacetate solution (see example 1). After 3 hours of stirring, 8ml of benzene and then aqueous oxalic acid (94 mg in 1.2 ml) are added.The precipitate is removed by filtration and the benzene solution iswashed with water until neutral. Removal of the solvent affords 0.32 gof5-iodo-5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl)-pentanoicacid methyl ester.

EXAMPLE 41

Upon oxidation of the 6'-exo-hydroxymethyl-7'-endo-hydroxy derivativesprepared according to examples 36-39, following the procedure of example40, the corresponding 6'-exo-formyl derivatives are prepared.

EXAMPLE 42

A solution of 3.4 g of (2-oxo-heptyl)dimethoxyphosphonate in 50 ml ofdimethoxyethane is added dropwise to a suspension of 0.45 g of 80% NaH(mineral oil dispersion). After stirring for 1 hour, a solution of 2.7 gof 5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester in 40 ml of dimethoxyethane is added.In 10 minutes this is diluted with 50 ml of a 30% aqueous solution ofmonobasic sodium phosphate. The organic phase is separated, the aqueousphase is re-extracted, and the combined organic extract is evaporated.Purification of the crude product on 50 g of silica gel(cyclohexane:ethyl ether, 50:50) gives 1.1 g of5-[6'-exo-(3"-oxo-oct-1"-trans-en-1"-yl)-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-endo-yl]-pentanoicacid methyl ester or13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxoprost-13-enoic acid methyl esterand 0.98 g of5-[6'-exo-(3"-oxo-oct-1"-trans-en-1"-yl)-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-exo-yl]-pentanoicacid methyl ester or13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acid methyl ester,plus 0.9 g of a 1:1 mixture of the two isomers (3'-exo and 3'-endo, or6αH and 6βH). This last mixture is separated into its two isomericcomponents by thin layer chromatography with ethyl ether. They show thefollowing absorptions, respectively: λ_(max) ^(MeOH) =230 mμ, ε=13,070;λ_(max) ^(MeOH) =228 mμ, ε=12,200.

N.M.R. (CDCl₃) 0.9 t 3H C₂₀ -CH₃, 3.68 s 3H CO₂ CH₃, 6.16 δ1H vinylicproton at C₁₄ (J_(H).sbsb.14_(-H).sbsb.15 16 Hz); 6.71 q 1H vinylicproton at C₁₃ (J_(H).sbsb.13 9 H_(z)).

By the same procedure, from the corresponding 5-H and 5-halo compounds,the following prostenoic acid derivatives are prepared:

13t-6αH-6(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester;

13t-6αH-6(9α)-oxide-5-chloro-15-oxo-prost-13-enoic acid methyl ester;

13t-6αH-6(9α)-oxide-5-bromo-15-oxo-prost-13-enoic acid methyl ester;

13-6αH-6(9α)-oxide-5-iodo-15-oxo-prost-13-enoic acid methyl ester;

13t-6αH-6(9α)-oxide-5-chloro-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13t-6αH-6(9α)-oxide-5-bromo-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester, N.M.R.=3.67 s 3H CO₂ CH₃ ; 3.95 m 4H C₅,C₉,C₁₁ protons andHx/Hy proton at C₄ ; 4.3 m 1H 6αH; 6.15 d 1H C₁₄ proton; 6.63 q 1H C₁₃proton;

13t-6αH-6(9α)-oxide-5-iodo-11α-hydroxy-15-oxo-prost-13-enoic acid methylester, N.M.R. 0.9 s 3H C₂₀ CH₃, 3.53 m 1H proton at C₅, 3.6 s 3H CO₂ CH₃3.9 m H proton at C₄, 4.1 m 2H proton at C₉, C₁₁ ; 4.4 m 1H 6αH; 6.2 d1H proton at C₁₄ 6.75 q 1H proton at C₁₃ ;

13t-6βH-6(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester;

13t-6βH-6(9α)-oxide-5-chloro-15-oxo-prost-13-enoic acid methyl ester;

13t-6βH-6(9α)-oxide-5-bromo-15-oxo-prost-13-enoic acid methyl ester;

13t-6βH-6(9α)-oxide-5-iodo-15-oxo-prost-13-enoic acid methyl ester;

13t-6βH-6(9α)-oxide-5-chloro-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13t-6βH-6(9α)-oxide-5-bromo-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester, N.M.R.: 3.65 s 3H CO₂ CH₃ ; 4.00 m 3H proton at C₅, C₉,C₁₁, 4.6 m 1H 6βH; 6.2 d 1H proton at C₁₄ ; 6.64 q 1H proton at C₁₃ ;

13t-6βH-6(9α)-oxide-5-iodo-11α-hydroxy-15-oxo-prost-13-enoic acid methylester; N.M.R. 3.66 s 3H CO₂ CH₃, 3.96 m 3H protons at C₉, C₁₁ and C₅,4.6 m 1H 6βH, 6.21 d 1H proton at C₁₄ 6.75 q 1H proton at C₁₃.

EXAMPLE 43

A solution of 2.16 g of (2-oxo-octyl)dimethylphosphonate in 20 ml ofbenzene is added dropwise to a suspension of 292 mg of NaH (75% mineraloil dispersion) in 30 ml of benzene. After 30 minutes of stirring, asolution of 2.6 g of4-bromo-4-(7'-exo-formyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester in 20 ml of benzene is added drop bydrop. Stirring is continued for another 30 minutes, and 24 ml of a 30%aqueous solution of NaH₂ PO₄ is added. The organic phase is separated,and the aqueous phase is reextracted with benzene. The organic layersare combined and evaporated to dryness. The residue is purified onsilica gel (50 g) with CH₂ Cl₂ :ethyl ether (120:40) as eluent to give0.52 g of4-bromo-4-[7'-exo-(3"-oxo-oct-1"-trans-1"-enyl)-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-endo-yl]-butanoic acid methyl ester or13-trans-4-bromo-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester and 1.45 g of4-bromo-4-[7'-exo-(3"-oxo-oct-1"-trans-1"-enyl)-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-exo-yl]-butanoicacid methyl ester or13-trans-4-bromo-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester. Methanolic solutions of these two compounds absorb in theUV at λ_(max) ^(MeOH) =230 mμ, ε=10,640, and λ_(max) ^(MeOH) =229 mμ,ε=11,600, respectively.

The same procedure, starting from the 4-H and 4-halo bicycloderivatives, gives the following prostenoic acids:

13-trans-5βH-5(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester;

13-trans-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acid methylester;

13-trans-4-chloro-5βH-5(9α)-oxide-15-oxo-prost-13-enoic acid methylester;

13-trans-4-chloro-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13-trans-4-bromo-5βH-5(9α)-oxide-15-oxo-prost-13-enoic acid methylester;

13-trans-4-bromo-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13-trans-4-iodo-5βH-5(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester;

13-trans-4-iodo-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13-trans-5αH-5(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester;

13-trans-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acid methylester;

13-trans-4-chloro-5αH-5(9α)-oxide-15-oxo-prost-13-enoic acid methylester;

13-trans-4-chloro-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13-trans-4-bromo-5αH-5(9α)-oxide-15-oxo-prost-13-enoic acid methylester;

13-trans-4-bromo-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester;

13-trans-4-iodo-5αH-5(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester;

13-trans-4-iodo-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester.

EXAMPLE 44

By the procedure of example 42, the reaction of 620 mg of(2-oxo-3-methyl-4-butoxybutyl)phosphonate with 74 mg of NaH (75%) and0.43 g of 5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester in dimethoxyethane gives, afterchromatography on silica gel (25 g) with 1:1 ethyl ether:hexane aseluent, 0.15 g of13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid methyl ester (λ_(max) =238 mμ, ε=14,500) and 300 mg of the6βH-isomer (λ_(max) =237 mμ, ε=12,280).

Mass spectrum: m/e 410 M⁺, m/e 392 M⁺ -H₂ O; m/e 379 M⁺ -OCH₃ ; m/e 295M⁺ -115, m/e 115 ##STR53## The two isomers present similar spectra withminimal differences at level of secondary fragmentation.

Using the same procedure the 5-chloro, 5-bromo and 5-iodo 13t-6-H-6(9α)-oxide-11α-hydroxy-15-oxo-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid methyl ester.

EXAMPLE 45

By the procedure of example 44, from4-(7'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester and the 4-iodo bicyclic derivative thefollowing are obtained:

13t-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid methyl ester;

13t-4-iodo-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid methyl ester;

13t-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid methyl ester;

13t-4-iodo-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid methyl ester.

EXAMPLE 46

To a suspension of 45 mg of 80% NaH in 10 ml of benzene is added asolution of 375 mg of (2-oxo-3,3-dimethyl-heptyl)dimethylphosphonate in10 ml of benzene, followed 30 minutes later by a solution of 0.305 g of5-iodo-5-(6'-exo-formyl-2'-oxa-bicyclo[3.3.0]-octan-3' -yl)-pentanoicacid methyl ester. After stirring for 45 minutes, the mixture is dilutedwith 10% aqueous NaH₂ PO₄. The organic phase is washed with neutral,dried and concentrated to small volume. Adsorption on silica gel andelution with cyclohexane:ethyl ether (90:10) give 0.12 g of13-t-5-iodo-6βH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester and 0.095 g of13t-5-iodo-6αH-6(9α)-oxide-15-oxo-16,16-dimethyl-13-enoic acid methylester.

EXAMPLE 47

By substituting in the procedure of example 46 the formyl derivativesprepared according to example 34, the following 16,16-dimethylderivatives are prepared:

13t-6βH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acid methylester;

13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5βH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acid methylester;

13t-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5-chloro-6βH-6(9α)-oxide-15-oxo-16,16-diemthyl-prost-13-enoic acidmethyl ester;

13t-5-chloro-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-4-chloro-5βH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-4-chloro-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5-bromo-6βH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-5-bromo-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-4-bromo-5βH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-4-bromo-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5-iodo-6βH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-5-iodo-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-4-iodo-5βH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-4-iodo-5βH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-6αH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acid methylester;

13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5αH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acid methylester;

13t-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5-chloro-6αH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-5-chloro-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-4-chloro-5αH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-4-chloro-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5-bromo-6αH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13 enoic acidmethyl ester;

13t-5-bromo-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-4-bromo-5αH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-4-bromo-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-5-iodo-6αH-6(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-5-iodo-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

13t-4-iodo-5αH-5(9α)-oxide-15-oxo-16,16-dimethyl-prost-13-enoic acidmethyl ester;

13t-4-iodo-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-16,16-dimethyl-prost-13-enoicacid methyl ester;

EXAMPLE 48

To a suspension of 178 mg of NaH (75% mineral oil dispersion) in 15 mlof benzene is added dropwise a solution of 1.55 g of[2-oxo-3(S,R)-fluoro-4-cyclohexyl-butyl]-dimethylphosphonate in 10 ml ofanhydrous benzene. After 30 minutes of stirring, a solution of 1 g of5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester is added and stirring is continued foranother hour. The mixture is neutralized with 30% aqueous NaH₂ PO₄, andthe organic phase is separated, concentrated and adsorbed on silica gel.Elution with CH₂ Cl₂ :Et₂ O (90:10) gives, 0.62 g of13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester (λ_(max) ^(MeOH) =238 mμ, ε=12,765) and 0.31 g of the6βH isomer (α_(max) ^(MeOH) =238 mμ, ε=9.870).

The N.M.R. data for the former compound are the following (CDCl₃) p.p.m.3.64 s 3H CO₂ CH₃, 3.8 m 1H C₉ proton, 4.03 q 1H proton at C₁₁, 4.3 m 1H6αH, 5.00 and 5.55 t,t 1/2H, 1/2H proton at C₁₆ J_(HF) 55 Hz, 6.54 q 1Hproton at C₁₄ 6.9 q 1H proton at C₁₃ J_(H).sbsb.14_(-H).sbsb.12 3.5 Hz,J_(H).sbsb.13_(-H).sbsb.12 7.5 Hz, J_(H).sbsb.13_(-H).sbsb.14 15.5 Hz.

Treating this compound with pyridine and acetic anhydride it isconverted into the 11α-acetoxy derivative, for which the N.M.R. dataare: (CHCl₃) p.p.m. 2.02 s 3H OCOCH₃, 3.64 s 3H CO₂ CH₃, 3.8 proton atC₉, 4.25 m 1H 6αH; 4.66, 5.22 t,t 1/2H, 1/2H proton at C₁₆ ; 4.97 q 1Hproton at C₁₁ ; 6.51 proton at C₁₄, 6.90 proton at C₁₃.

For the diastereoisomeric hydroxy ketones the mass spectrum shows thefollowing masses: M⁺ 424 m/e and then M⁺ -H₂ O, M⁺ -HF, M⁺ -CH₃ OH/CH₂ OM⁺ -CH₂ ═CHOH (basis ion) M⁺ -115 M⁺ -44-59 and M⁺ -(CMF-CH₂ C₆ H₁₁). Inmass spectrum of exo-diastereoisomer the following masses arepredominant: M⁺ -CH₃ OH and M⁺ -44-28; in that of endo-diastereoisomerthe predominant ones are M⁺ -CH₃ O and M⁺ -44-18.

From the 5-bromo derivative,13t-5-bromo-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester is prepared.

EXAMPLE 49

Substituting in the procedure of example 48 a phosphonate chosen from(2-oxo-4-cyclohexyl-butyl)-dimethylphosphonate and(2-oxo-4-phenyl-butyl)-dimethylphosphonate, the following were prepared:

13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester,13t-6β-H-6(9α)-oxide-11α-hydroxy-15-oxo-17-phenyl-18,19,20-trinor-prost-13-enoicacid methyl ester and their 6αH isomers.

EXAMPLE 50

To a suspension of 178 mg of NaH (75% mineral oil dispersion) inanhydrous tetrahydrofuran at 0° C. is added dropwise with stirring asolution of 1.63 g of2-oxo-3-(m-chlorophenoxy)-propyl-dimethylphosphonate in 10 ml ofanhydrous THF. After 30 minutes of stirring, a solution of 1 g of5-(6'-exo-formyl-7'-endo-2'-oxa-bicyclo[3.3.0]octan-3' -yl)-pentanoicacid methyl ester is added and stirring is continued for another hour.The mixture is acidified with aqueous NaH₂ PO₄, the organic phase isseparated, and the aqueous phase is re-extracted with benzene. From thecombined organic extract, after chromatography on silica gel with CH₂Cl₂ :Et₂ O (95:5) as eluent, one obtains of 0.43 g of13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16-m-chlorophenoxy-17,18,19,20-tetranor-prost-13-enoicacid methyl ester (λ_(max) ^(MeOH) =227 mμ, ε=16,800) and 0.11 g of the6βH isomer (λ_(max) =224 mμ, ε=16,900). Both the diastereoisomers showthe mass peak m/e 436 in according to C₂₃ H₂₉ ClO₆. This ion is involvedin the following fragmentation: M⁺ -H₂ O, M⁺ -OCH₃ /CH₃ OH, M⁺ -44, M⁺-(O-C₆ H₄ Cl), M⁺ -H₂ O-(O-C₆ H₄ Cl) and M⁺ -(CH₂)₄ -CO₂ CH₃, sofurthermore confirming the proposed structure.

The following differences are between the two diastereoisomers: the exo6αH isomer shows a peak at M⁺ -32 and a little intense peak at M⁺ -44 onthe other hand the endo 6βH isomer shows a peak at M⁺ -31 and an intensepeak M⁺ -44.

EXAMPLE 51

The substitution of a phosphonate chosen from2-oxo-3-(m-trifluoromethylphenoxy)-propyl-dimethylphosphonate and2-oxo-3-(p-fluorophenoxy)-propyl-dimethylphosphonate in the procedure ofexample 50 leads to the following compounds, respectively:

13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16m-trifluoromethylphenoxy-17,18,19,20-tetranor-prost-13-enoicacid methyl ester,13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16-p-fluorophenoxy-17,18,19,20-tetranor-prost-13-enoicacid methyl ester, and their 6αH isomers.

The mass spectra of all the compounds agree with the proposed structurefor example showing the mass peak M⁺ -115; an interesting differencebetween the endo- and exo- trifluoromethyl analogous is that the masspeaks M⁺ -CH₃ OH and M⁺ -CF₃ -C₆ H₄ -OH are in the exo-isomer and themass peak M⁺ -CH₃ O and M⁺ -CF₃ -C₆ H₄ -O are in the endo-isomer.

EXAMPLE 52

The substitution of (2-oxo-3S-methyl-butyl)-dimethylphosphonate for thephosphonate in the procedure of example 48 gave13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16S-methyl-prost-13-enoic acidmethyl ester and its 6αH isomer. To a solution of 2.2 g of the 6βHisomer in 2.6 ml of pyridine, cooled to 0° C., is added 1.05 ml ofacetic anhydride. The solution is held at 0° C. overnight and then addedto an excess of cold 0.05 N sulfuric acid. Extraction with ethyl etherand evaporation to dryness give 2.3 g of13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16S-methyl-prost-13-enoic acidmethyl ester-11-acetate λ_(max) ^(MeOH) =229 mμ, ε=12,050).

875 mg of bromine in glacial acetic acid is added dropwise to a solutionof the latter compound in 10 ml of glacial acetic acid, until a lightorange color appears. 1.52 g of anhydrous potassium carbonate is thenadded and the resulting mixture is held at 80° C. for 4-5 hours tocomplete the precipitation of potassium bromide. Excess acetic acid isremoved under vacuum, water is added, and the pH is brought to pH 6.8with alkaline hydrate. This is then extracted with ethyl ether and theorganic phase is reduced in volume. Adsorption on silica gel and elutionwith methylene chloride:ethyl ether (70:30) gives 2.01 g of13t-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-16S-methyl-prost-13-enoicacid methyl ester-11-acetate, λ_(max) ^(MeOH) =249 mμ, ε=11,450.

The 6αH isomer is similarly prepared.

EXAMPLE 53

A solution of 2.06 g of (2-oxo-3S-methylheptyl)-dimethylphosphonate in20 ml of dimethoxyethane is added dropwise to a suspension of 0.265 g ofNaH (80% mineral oil dispersion) in DME (10 ml). After stirring for 30minutes, 1.6 g of N-bromosuccinimide is added and vigorous stirring iscontinued for 10 minutes. 1.35 g of5-(6'-exo-formyl-7'-endohydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester in 5 ml of dimethoxyethane is thenadded. The mixture is stirred for 1 hour and 20 ml of 30% NaH₂ PO₄ isadded. After the usual work-up, crude 14-bromo-enone is obtained.Separation on silica gel with methylene chloride: ethyl ether (85:15)gives 0.9 g of13t-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-16S-methyl-prost-13-enoicacid methyl ester and 0.92 g of the 6αH isomer. Upon treatment with 0.4ml of pyridine and 0.2 ml of acetic anhydride, 0.2 g of the 6βH isomergives 0.205 g of the 11-acetoxy derivative, identical in all respectswith that made by the procedure of example 52.

EXAMPLE 54

A solution of 0.43 g of (2-oxo-octyl)-dimethylphosphonate in 10 ml ofbenzene is added dropwise to a suspension of 54 mg of NaH (80% mineraloil dispersion) in 5 ml of benzene. After 1 hour, when the evolution ofH₂ has ceased, 0.32 g of N-bromosuccinimide is added all at once. To thecarbanion thus prepared, of (1-bromo-2-oxo-octyl)-dimethylphosphonate isadded a solution of 270 mg of5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester in 8 ml of benzene. After 30 minutes,the reaction is quenched by the addition of 20 ml of a 10% solution ofNaH₂ PO₄. The organic phase, after being washed until neutral, gives0.31 g of 13t-6H-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-20-methyl-prost-13-enoic acidmethyl ester; this is then separated into the 6αH and 6βH isomers.

EXAMPLE 55

Upon substitution of the (2-oxo-octyl)-dimethylphosphonate in theprocedure of example 54 with(2-oxo-4-cyclohexylbutyl)-dimethylphosphonate and(2-oxo-4-phenyl-butyl)-dimethylphosphonate, the following compounds wereprepared:13t-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester; 13t-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-17-phenyl-18,19,20-trinor-prost-13-enoicacid methyl ester.

EXAMPLE 56

By substituting the formyl derivatives in examples 53, 54 and 55 with5-iodo-5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester,4-iodo-4-(7'-exo-formyl-8'-endo-hydroxy-2'-oxa-bicyclo[3.4.0]nonan-3'-yl)-butanoic acid methyl ester, and the corresponding 4-H derivative,the following compounds were prepared:

13t-5-iodo-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-16S-methyl-prost-13-enoicacid methyl ester;

13t-4-iodo-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-16S-methyl-prost-13-enoicacid methyl ester;

13t-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-16S-methyl-prost-13-enoicacid methyl ester;

13t-5-iodo-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-20-methyl-prost-13-enoicacid methyl ester;

13t-4-iodo-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-20-methyl-prost-13-enoicacid methyl ester;

13t-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-20-methyl-prost-13-enoicacid methyl ester;

13t-5-iodo-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester;

13t-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester;

13t-5-iodo-6βH-6(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-17-phenyl-18,19,20-trinor-prost-13-enoicacid methyl ester;

13t-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-17-phenyl-18,19,20-trinor-prost-13-enoicacid methyl ester.

EXAMPLE 57

A solution of 0.61 g of 2-oxo-octyl-triphenylphosphonium bromide in 6 mlof DMSO is added to a solution of 0.15 g of potassium t-butylate in 3 mlof DMSO while keeping the reaction temperature at 16°-19° C. 0.27 g of5-(6'-exo-formyl-7'-endo-hydroxy-2'-oxa-bicyclo[3.3.0]octan-3'-yl)-pentanoic acid methyl ester in 8 ml of anhydrous tetrahydrofuran isthen added. After 30 minutes of stirring, an equal volume of water isadded and the mixture is extracted with ethyl ether. The combinedorganic extract is washed until neutral and the solvent is evaporated.Chromatography on silica gel (cyclohexane:ethyl ether, 40:60) gives 0.21g of 13t-6 H-6(9α)-oxide-11α-hydroxy-15-oxo-20-methyl-prost-13-enoicacid methyl ester. Subsequent preparative thin layer chromatography(SiO₂ -Et₂ O) allows separation of the 6αH and 6βH isomers.

EXAMPLE 58

A solution of d,l-13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-13-enoic acidmethyl ester (exo-isomer at greatest R_(f)), (0.9 g), in dry ethyl ether(30 ml) is dripped on to a stirred 0.1 M solution of Zn(BH₄)₂ in dryethyl ether (30 ml), over 15 minutes. After 2 hours, the excess reagentis decomposed by cautious addition of saturated NaCl solution andaqueous 2 N sulfuric acid. The organic layer is separated, washed toneutral and evaporated to dryness affording a residue which is adsorbedon silica gel, eluted with ethyl ether to yield 0.38 g of13t-6αH-6(9α)-oxide-11α,15R-dihydroxy-prostenoic acid methyl ester, asan oil, and 0.42 g ofd,l-13t-6αH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acid methyl ester,m.p. 69°-71° C. (mass spectrum m/e 350 M⁺ -18, 319 M⁺ -18 -CH₃ O; 318 M⁺-18-CH₃ OH). A solution in methanol (4 ml) of this ester is treated with60 mg of lithium hydroxide and water (0.8 ml) for 8 hours at roomtemperature. The methanol is removed in vacuum, the residue is dilutedwith water and extracted with ethyl ether to remove neutral impurities.The alkaline phase is treated with aqueous saturated NaH₂ PO₄ solutionuntil to pH 5 and then extracted with ethyl ether. The later organicphases are collected to yield after evaporation of the solvents the freeacid d,l-13t-6αH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acid, m.p.105°-106° C. The 15R-hydroxy compound is a non-crystallizable oil.

In the same way using nat-keto compound in the reduction reaction withZn(BH₄)₂ we obtained besides the 15-epi alcohol, thenat-13t-6αH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acid methyl ester,m.p. 71°-72° C. [α]_(D) =+10.2°, [α]₃₆₅° =+32.2° (CHCl₃) and aftersaponification the free acid m.p. 101°-102° C. [α]_(D) =+6.34°, [α]₃₆₅°=+33.2° (CHCl₃).

Starting from the endo-diastereoisomers (more polar compounds), thefollowing esters were obtained:

13t-6βH-6(9α)-oxide-11α,15R-dihydroxy-prostenoic acid methyl ester (d,l,nat-, ent- oils);

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acid methyl ester (d,l,nat-, [α]_(D) =+24.5°, [α]₃₆₅° =+52.9° (CHCl₃) oil; ent[α]_(D) =-22°,oil), and after saponification the following free acids:

13t-6βH-6(9α)-oxide-11α,15R-dihydroxy-prostenoic acid (d,l, nat-, ent-oils);

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acid (d,l oil, nat-,m.p. 78°-80° C. [α]_(D) =+32.5°, [α]₃₆₅° =+11.6° (EtOH), ent- m.p.78°-79° C., [α]_(D) =-31° (EtOH)).

EXAMPLE 59

With the temperature of the reaction mixture kept at around -5° to -8°C., a solution of 159 mg of NaBH₄ in 7 ml of propan-2-ol, is graduallyadded to a solution of 0.332 g of anhydrous CaCl₂ in propan-2-ol (7 ml);then, under stirring, a solution of 0.38 g of13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester in 3 ml of propan-2-ol is added to the above preparedCa(BH₄)₂ in a period of 40 minutes. The reaction mixture is kept understirring at a temperature ranging at ±5° C., then the excess reagent isdestroyed by addition of 5 ml of acetone and 2 ml of water. The solventis evaporated under vacuum and the residue is partitioned among water,0.1 N H₂ SO₄ and ethyl acetate. The organic extracts are collected,washed until neutral and after evaporation of solvent the residuechromatographed on silica gel (30 g) using CH₂ Cl₂ -ethyl ether 70:30 aseluent. The eluate yields 0.21 g of13t-6αH-6(9α)-oxide-11α,15R-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester, and 0.14 g of the 15S-epimer, m.p. 83° C.-84° C.(from ethyl ether). In the same way, reduction of the 6βH-isomer (220mg) yields 0.1 g of13t-6βH-6(9α)-oxide-11α,15R-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid methyl ester, m.p. 63°-64° C. (from isopropylic ether), and 60 mgof 15S-alcohol.

EXAMPLE 60

A solution of 0.15 g of13t-6αH-6(9α)-oxide-11α-hydroxy-15-keto-16-methyl-16-butoxy-18,19,20-trinor-prostenoicacid methyl ester in methanol (5 ml) is cooled at -5°÷-10° C. andreduced by addition of a solution of NaBH₄ (30 mg) in water (0.5 ml).The reaction mixture is neutralized by addition of 15% aqueous NaH₂ PO₄solution after 15 minutes and then evaporated in vacuum. The aqueousresidue is extracted with ethyl ether to yield a crude mixture ofepimeric 15R,15S-alcohols. Chromatographic separation on silica gel (CH₂Cl₂ -ethyl ether 70:30 as eluent) affords respectively13t-6αH-6(9α)-oxide-11α,15R-dihydroxy-16-methyl-16-butoxy-18,19,20-trinor-prostenoicacid methyl ester (45 mg) and 15S-hydroxy-epimer (62 mg).

EXAMPLE 61

By reduction of13t-5αH-5(9α)-oxide-11α-hydroxy-15-keto-16-methyl-16-butoxy-18,19,20-trinor-prostenoicacid methyl ester, under the same trial conditions as in the procedureof example 60 followed by chromatographic separation of the epimericalcohols (300 mg) on silica gel (12 g) with methylene chloride-ethylether 75:25 eluent, we respectively obtained 100 mg of13t-5αH-5(9α)-oxide-11α-15R-dihydroxy-16-methyl-16-butoxy-18,19,20-trinor-prostenoicacid methyl ester, and 110 mg of 15S-epimer. These are then saponifiedto yield the corresponding free acids.

EXAMPLE 62

Dropwise, to a stirred 0.12 M solution of zincborohydride in ethyl ether(8 ml) a solution of 0.135 g of13t-5-bromo-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-prostenoic acid methylester in 2 ml of anhydrous Et₂ O is added. The mixture is stirred for 2hours and the excess reagent is decomposed with water-2 N H₂ SO₄. Theorganic phase is separated, washed to neutral and evaporated to dryness.After TLC on silica gel with ethyl ether-ethyl acetate 90:10, 38 mg of13t-5-bromo-6αH-6(9α)-oxide-11α,15R-dihydroxy-prostenoic acid methylester and 46 mg of 15S-epimer were obtained.

EXAMPLE 63

Starting from13t-5,14-dibromo-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-prostenoic acidmethyl ester (0.2 g) and using a mixture of CH₂ Cl₂ -ethyl ether 60:40,during the chromatographic separation on silica gel, we obtained 0.056 gof 13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15R-dihydroxy-prostenoic acidmethyl ester and 0.098 g of 15S-isomer.

A solution of this product in methanol is then hydrolized with aqueousLiOH to yield 72 mg of13t-5,14-dibromo-6αH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acid.

EXAMPLE 64

Using, in the procedure of example 60, isopropanol as solvent and NaBH₄(45 mg), the reduction of13t-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-16-(m-trifluoromethyl)-phenoxy-17,18,19,20-tetranor-prost-13-enoicacid methyl ester (0.47 g) yields 0.20 g of13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(m-trifluoromethyl)-phenoxy-17,18,19,20-tetranor-prost-13-enoicacid methyl ester, [α]_(D) =+33.3° (MeOH) and 0.18 g of 15R-epimer. The6αH-15S-alcohol epimer is an oil with [α]_(D) =+12° (MeOH).

EXAMPLE 65

A solution in dry ethyl ether (20 ml) of13t-16S-methyl-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester (0.002 M, 0.72 g) is added to a stirred etheral solution ofzinc borohydride (0.01 M, 100 ml). The excess reagent is destroyed,after 30-45 minutes, by addition of 2 N-sulphuric acid in NaCl saturatedaqueous solution. The organic phase is washed until neutral andevaporated to dryness. The residue is chromatographied on silica gel (25g) using methylene-chloride:ethyl ether (80:20) as eluent affording(7.5.10⁻⁴ M, 0.27 g) of the 15R-hydroxy-isomer and (1.1.10⁻⁴ M; 0.38 g)of the 15S-alcohol:13t-16S-methyl-6αH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoic acidmethyl ester. Using this procedure, the following methyl esters wereobtained:

13t-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoic acid;

13t-6βH-6(9α)-oxide-16R-methyl-11α,15S-dihydroxy-prost-13-enoic acid;

13t-6βH-6(9α)-oxide-16,16-dimethyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-6αH-6(9α)-oxide-20-methyl-11α,15S-dihydroxy-prost-13-enoic acid,m.p. 57°-59° C. [α]_(D) =+14°, [α]₃₆₅° =+47° (CHCl₃);

13t-6βH-6(9α)-oxide-20S-methyl-11α,15S-dihydroxy-prost-13-enoic acid,m.p. 38°-39° C., [α]_(D) =+21.7°, [α]₃₆₅° =+77° (CHCl₃);

13t-5-bromo-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-16R-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-16,16-dimethyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-prost-13-enoicacid, [α]_(D) =+38°;

13t-5-iodo-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-16R-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-16,16-dimethyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-prost-13-enoicacid, [α]_(D) =+23°, [α]₃₆₅° =+78° (CHCl₃);

13t-5-chloro-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoic acid;

13t-5βH-5(9α)-oxide-16,16-dimethyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-16R-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-16,16-dimethyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-4-iodo-5βH-5(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-4-chloro-5βH-5(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-14-bromoprost-13-enoicacid;

13t-6βH-6(9α)-oxide-16R-methyl-11α,15S-dihydroxy-14-bromoprost-13-enoicacid;

13t-6βH-6(9α)-oxide-20-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-15(S,R)-20-dimethyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-16S-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-16R-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-20-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-16(S,R)-20-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-16R-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-20-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-16(S,R)-20-dimethyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-16S-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-16R-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-20-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-16(S,R)-20-dimethyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;

together with their 15R-epimeric alcohols, when the corresponding15-keto compounds are submitted to reduction followed by chromatographicseparation. Starting from 6αH and 5αH diastereoisomeric 15-ketocompounds we prepare the corresponding 15S- and 15R-alcohols. All thesecompounds are then saponified to yield the corresponding free acids.

EXAMPLE 66

A solution of13t-5-iodo-6βH-6(9α)-oxide-16R-methyl-15-oxo-prost-13-enoic acid methylester (0.32 g) in ethyl ether (8 ml) is added to a stirred solution ofzinc borohydride in ethyl ether (25 ml). After 30 minutes, the excessreagent was destroyed by addition of a saturated solution of NaCl andNH₂ SO₄. After the usual work up the organic phase is separated and thecrude residue is chromatographied on SiO₂ (eluent (CH₂ Cl₂ -ethyl ether)to yield 0.16 g of13t-5-iodo-6βH-6(9α)-oxide-16R-methyl-15S-hydroxy-prost-13-enoic acidmethyl ester and 0.095 g of 15R-epimer. Using this procedure thefollowing methyl esters were obtained:

13t-6βH-6(9α)-oxide-15S-hydroxy-16S-methyl-prost-13-enoic acid;

13t-6βH-6(9α)-oxide-15S-hydroxy-16R-methyl-prost-13-enoic acid;

13t-6βH-6(9α)-oxide-15S-hydroxy-16,16-dimethyl-prost-13-enoic acid;

13t-5βH-5(9α)-oxide-15S-hydroxy-16S-methyl-prost-13-enoic acid;

13t-5βH-5(9α)-oxide-15S-hydroxy-16R-methyl-prost-13-enoic acid;

13t-5βH-5(9α)-oxide-15S-hydroxy-16,16-dimethyl-prost-13-enoic acid;

13t-5-bromo-6βH-6(9α)-oxide-15S-hydroxy-16S-methyl-prost-13-enoic acid;

13t-5-bromo-6βH-6(9α)-oxide-15S-hydroxy-16R-methyl-prost-13-enoic acid;

13t-5-bromo-6βH-6(9α)-oxide-15S-hydroxy-16,16-dimethyl-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-15S-hydroxy-16S,20-dimethylprost-13-enoicacid,

together with their 15R-epimeric alcohols, when the corresponding15-keto compounds are submitted to reduction followed by chromatographicseparation.

Starting from 6αH and 5αH diastereoisomeric 15-keto compounds we preparethe corresponding 15S- and 15R-alcohols.

EXAMPLE 67

The following 15S-hydroxy-9α-oxide prostenoic acids methyl esterstogether with their 15R-epimeric alcohols are obtained after reductionof the corresponding 15-keto compounds using one of the proceduresdescribed in examples 58 to 66:

13t-6βH-(6(9α)-oxide-11α,15S-dihydroxy-13-protenoic acid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid:13t-14-chloro-6βH-6(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid;

13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoic acid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-5-iodo-14-bromo-6β-H-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-14-bromo-6β-6(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-dihydroxy-16-difluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-difluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-phenyl-18,19,20-trinor-prost-13-enoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-phenyl-18,19,20-trinor-prost-13-enoicacid;

13t-6βH-(9α)-oxide-11α,15S-dihydroxy-17cyclopentyl-18,19,20-trinor-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoic acid;

13t-5-bromo-6ηH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-5-chloro-6βH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-methyl-16-butoxy-18,19,20-trinor-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-methyl-16-propoxy-18,19,20-trinor-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-methyl-16-amyloxy-18,19,20-trinor-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-17-cycloheptyl-18,19,20-trinor-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(p-fluoro)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-cyclohexyloxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(m-chloro)-phenoxy-17,18,19,20-tetranor-14-prostenoicacid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(m-trifluoromethyl)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(p-fluoro)-phenoxy-17,18,19,20-tetranor-13-protenoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(m-chloro)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-m-trifluoromethyl)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(p-fluoro)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-cyclohexyloxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(m-chloro)-phenoxy-17,18,19,20-tetranor-13-protenoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-(m-trifluoromethyl)-phenoxy-17,18,19,20-tetraor-13-protenoicacid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid;

13t-14-bromo-5βH-5βH-5(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid;

13t-14-chloro-5βH-5(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid;

13t-4,14-dibromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acid;

13-t-5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoic acid;

13t-14-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-4,14-dibromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-4-iodo-5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-4-iodo-14-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid;

13t-14-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-4,14-dibromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-4-bromo-5βH-5(9α)-oxide-11;60,15S-dihydroxy-16(S,R)-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-phenyl-18,19,20-trinor-prost-13-enoicacid;

13-t-14-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16(S,R)-fluoro-17-phenyl-18,19,20-trinor-prost-13-enoicacid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-17-cyclopentyl-18,19,20-trinor-prost-13-enoicacid;

13t-5βH(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-14-bromo-5βH-5(9α)-oxide-11α,15S-hydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13t-4,14-dibromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid;

13-t-5βH-5(9α)-oxide-11α,15S-dihydroxy-16-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-4-iodo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-4-iodo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16-cyclohexyloxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-4-iodo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16-(m-chloro)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid;

13t-4-iodo-5βH-5(9α)-oxide-11α,15S-dihydroxy-16-(m-trifluoromethyl)-phenoxy-17,18,19,20-tetranor-13-prostenoicacid.

In similar way, we prepare the diastereoisomeic αH-9α-oxide-15S- andαH-9α-oxide-15R-alcohols when weuse αH-9α-oxide-15-keto diastereisomeras starting material.

All these esters are then saponified to obtain the free acids.

EXAMPLE 68

0.46 g of 13t-5βH-(9α)-oxide-17S-methyl-11α-hydroxy-15-oxoprost-13-enoicacid methyl ester are treated with pyridine (2 ml) and acetic anhydride(1 ml). After 6 hours at room temperature the mixture is diluted withbrine, acidified to pH 4.5-4.8 and extracted with ethyl ether. Thecombined organic phases are then evaporated to dryness yielding 0.48 gof 11-acetoxy-derivative (λ_(max) ^(MeOH) =229 mμ, ε=11.058). A solutionof this compound in ethyl ether is then added dropwise to a solution ofZn(BH₄)₂ in ethyl ether. After 30 minutes the excess reagent isdecomposed with a N solution of H₂ SO₄ and after the usual worke-up,0.47 g of13t-5βH-5(9α)-oxide-16S-methyl-11α,15(S,R)-dihydroxy-13-prostenoic acidmethyl ester 11-acetate are obtained. A solution of this mixture in CH₂Cl₂ (5 ml) cooled to about -5° C. -10° C., is treated with a solution ofBF₃ etherate (1.2×10⁻⁴ M) in CH₂ Cl₂ and then with a 5% solution ofdiazomethane in CH₂ Cl₂ until a persistent yellow coloration. Thereaction mixture is evaporated to half volume under vacuum, washed witha 5% aqueous NaHCO₃ solution and water to neutral, and evaporated todryness to yield 0.47 g of13t-5βH-5(9α)-oxide-16S-methyl-11α-hydroxy-15(S,R)-methoxy-prost-13-enoicacid-11-acetate which is separated in the individual isomers bychromatography on SiO₂ using benzene-ethyl ether (85:15) as eluent. Onthe other hands, 0.21 g of the mixture of 15(S,R)-methoxy-derivatives isdissolved in dry methanol (4 ml) and selectively deacetilated bytreatment with 20 mg of K₂ CO₃ for 4 hours at room temperature. Afterneutralization by dilution with aqueous NaH₂ PO₄, the methanolevaporated under vacuum and the residue is extracted with ethyl ether(2×5) ethyl acetate (2×6 ml). The combined organic phases are evaporatedto dryness to yield 180 mg of the crude13t-5βH-5(9α)-oxide-16S-methyl-11α-hydroxy-15(S,R)-methoxy-prostenoicacid methyl ester, which is then readily separated by means of a silicagel column chromatography using CH₂ Cl₂ -ethyl ether 80:20 as eluent toyield the two pure isomers: 15S-methoxy and 15R-methoxy. Using the sameprocedure the following methyl esters were obtained:

13t-6βH-6(9α)-oxide-16S-methyl-11α-hydroxy-15S-methoxy-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-16R-methyl-11α-hydroxy-15S-methoxy-prost-13-enoicacid;

13t-6βH-6(9α)-oxide-20-methyl-11α-hydroxy-15S-methoxy-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-20-methyl-11α-hydroxy-15S-methoxy-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-11α-hydroxy-15S-methoxy-prost-13-enoic acid;

13t-5-bromo-6βH-6(9α)-oxide-16S-methyl-11α-hydroxy-15S-methoxy-prost-13-enoicacid,

and their epimeric 15R-methoxy compounds are obtained starting from thecorresponding 11-acetoxy-15-keto compounds.

Using this procedure the αH-diastereoisomer instead of the βH, thecorresponding αH-15-methoxy compounds are also obtained. The sameprocedure can be also utilized for any 15-keto compound, previouslydescribed and analogously an other diazo alkane can be used inside ofdiazomethane.

EXAMPLE 69

To a solution of 0.26 g of13t-6βH-6(9α)-oxide-15(S,R)-hydroxy-16S-methyl-prost-13-enoic acidmethyl ester in methylene chloride, treated with 0.3 ml of a solution ofBF₃ etherate in methylene chloride, cooled at -10°÷-8° C., a solution ofdiazoethane in methylene chloride is added until a persistent yellowcoloration is formed. The solvent is evaporated under vacuum and theresidue chromatographed on silica gel using ethyl ether-methylenechloride 10:90 as eluent to yield 0.115 g of13t-6βH-6(9α)-oxide-15S-ethoxy-16S-methyl-prostenoic acid methyl ester,and 0.1 g of 15R-ethoxy isomer. When a mixture of 15S,15R-alcohols, forexample 13t-6βH-6(9α)-oxide-11α,15(S,R)-dihydroxy-16S-methyl-prostenoicacid, containing a free 11-hydroxy group is submitted to the procedureof the examples 68 and 69, the simultaneous alkoxylation of the11-alcoholic function also occurs yielding with diazomethane for exampleafter chromatographic separation of13t-6βH-6(9α)-oxide-11α,15S-dimethoxy-16S-methyl-prostenoic acid methylester beside the 15R-epimeric derivative.

In a similar way the following 15S-alkoxy prostenoic derivatives wereobtained:

13t-5βH-5(9α)-oxide-11α,15S-dimethoxy-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dimethoxy-prostenoic acid;

13-t6βH-6(9α)-oxide-5-bromo-11α,15S-dimethoxy-prostenoic acid;

13t-6βH-6(9α)-oxide-5-iodo-11α,15S-dimethoxy-prostenoic acid;

13t-5βH-5(9α)-oxide-15S-methoxy-16S-methyl-prostenoic acid;

13-t-6βH-6(9α)-oxide-15S-methoxy-16S-methyl-prostenoic acid;

13t-6βH-6(9α)-oxide-15S-methoxy-16R-methyl-prostenoic acid;

13t-6βH-6(9α)-oxide-15S-methoxy-16-methyl-16-butoxy-18,19,20-trinor-prostenoicacid,

and their 15R epimers are obtained and when they are saponified withLiOH in methanol the free acids are prepared. The same procedure can beused to obtain diastereoisomeric αH-9α-oxide derivatives.

EXAMPLE 70

To a stirred solution of 1.33 g of13t-6αH-6(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acid methylester-11-acetate in 6 ml of toluene and 54 ml of benzene, cooled at +4°C., a solution of 1.67 g of methylmagnesium iodide in ethyl ether isadded. After 20 minutes, the excess reagent is decomposed with an iced20% solution of ammonium chloride in water. After dilution with onevolume of ethyl ether the organic phase is washed with water, sodiumbicarbonate and water, dried over magnesium sulphate, treated with 0.1ml of pyridine and evaporated to dryness to yield 1.2 g of13t-6αH-6(9α)-oxide-11α,15(S,R)-dihydroxy-15-methyl-prostenoicacid-methylester-11-acetate, of which 0.2 g are separated into the purecomponent by thin layer chromatography on silica gel, with benzene-ether60:40 eluent. 1 g of the mixture of the two alcohols is dissolved inanhydrous methanol (20 ml) and stirred for 4 hours with 0.25 g of K₂CO₃. The mixture is evaporated to dryness, the residue is partitionedbetween ethyl ether and aqueous 15% NaH₂ PO₄. The organic phase isevaporated in vacuum and the residue is absorbed on silica gel (200 g).Elution with ethyl ether-isopropylic ether 80:20 affords 0.20 g of13t-6αH-6(9α)-oxide-11α,15R-dihydroxy-15-methyl-prost-13-enoic acidmethyl ester, and 0.36 g of 15S-epimer. 0.16 g of this compound aredissolved in 12 ml of methanol and treated with 0.8 ml of water and 0.2g of K₂ CO₃. After 5 hours at room temperature the methanol isevaporated under vacuum, the residue is treated with 20% NaH₂ PO₄ andethyl acetate. The organic phase yields 0.14 g of13t-6αH-6(9α)-oxide-11α,15S-dihydroxy-15-methyl-prost-13-enoic acid. Thecorresponding 6βH-isomers are prepared in the same way.

EXAMPLE 71

To 1.79 g of 13t-5αH-5(9α)-oxide-11α-hydroxy-15-oxo-prost-13-enoic acidmethyl ester-11-acetate in 20 ml of anhydrous tetrahydrofurane, 50 ml of0.3 M ethynylmagnesium bromide in anhydrous tetrahydrofurane is added.Keep shaking for one hour, eliminate the excess reagent by treating witha saturated NH₄ Cl solution, concentrate the organic phase under vacuum,and take up with ethyl ether to yield 1.62 g of13t-5αH-5(9α)-oxide-11α,15(S,R)-dihydroxy-15-ethynyl-prost-13-enoic acidmethyl ester-11-acetate, which is dissolved in anhydrous methanol andtreated with 250 mg of anhydrous potassium carbonate for 3 hours undershaking. Evaporated under vacuum and dilute with 20% aqueous NaH₂ PO₄and ethyl ether. After evaporating the solvent, the organic phase yields1.41 g of13t-5αH-5(9α)-oxide-11α,15(S,R)-dihydroxy-15-ethynyl-prostanoic acidmethyl ester, which is separated into the two pure 15S-hydroxy and15R-hydroxy epimer by silica gel chromatography with benzene-ethyl ether1:1 as eluent, and after saponification of the 15S-hydroxy-epimer withK₂ CO₃ in methanol, there is yield of the13t-5αH-5(9α)-oxide-11α,15S-dihydroxy-15-ethynylprostenoic acid.

EXAMPLE 72

To a solution in tetrahydrofuran anhydrous (25 ml) of 1.41 g of13t-5-bromo-6βH-6(9α)-oxide-15-oxo-prost-13-enoic acid methyl ester, a0.5 M solution of magnesium vinyl bromide in tetrahydrofurane (25 ml) isadded at 0°-5° C. and let stand for 4 hours at room temperature.Decompose the excess reagent with a saturated solution of ammoniumchloride, distil the tetrahydrofurane under vacuum and take up withethyl ether. The organic phase is adsorbed on silica gel and eluted withmethylene chloride-ethyl ether to yield 0.41 g of13t-5-bromo-6βH-6(9α)-oxide-15R-hydroxy-15-vinyl-prostenoic acid methylester, and 0.62 g of 15S-isomer, which after saponification with LiOH inmethanol yields 0.49 g of pure13t-5-bromo-6βH-6(9α)-oxide-15S-hydroxy-15-vinyl-prostenoic acid.

EXAMPLE 73

A solution of 0.98 g of13t-5-bromo-6βH-6(9α)-oxide-11α-hydroxy-15-oxo-20-methyl-prostenoic acidmethyl ester-11-acetate in 30 ml of benzene-toluene (85:15) is cooled at3°-4° C. and to this a solution of 0.92 g of phenylmagnesium bromide inethyl ether-benzene 1:1 is added. Let stand for 5 hours at roomtemperature, then decompose the excess reagent with an iced solution of15% NH₄ Cl, wash the organic phase repeatedly with water to neutral thenevaporate. The crude 15-phenyl-15(S,R)-hydroxy derivative is dissolvedin anhydrous methanol to which is 0.25 g of K₂ CO₃ is added, keptshaking for 2 hours. Evaporate to dryness, dilute with aqueous 20% NaH₂PO₄ and ethyl ether, and from the organic phase after evaporation of thesolvent, there is a yield of 0.81 g of13t-5-bromo-6βH-6(ξα)-oxide-11α,15(S,R)-dihydroxy-15-phenyl-20-methyl-prostenoicacid methyl ester, which after separation on silica gel with ethyl etherelution yields the individual 15S and 15R isomers.

EXAMPLE 74

By reaction of the corresponding 15-oxo-derivative with a reagentselected from the group of an halogenide of methylmagnesium, ethylmagnesium, vinyl magnesium, ethynyl magnesium and phenyl magnesium,working to one of the procedures given in example 70 to 73, thefollowing methylesters were prepared:

13t-6βH-6(9α)-oxide-15S-hydroxy-15-methyl-prostenoic acid;

13t-6βH-6(9α)-oxide-15S-hydroxy-15,20-dimethyl-prostenoic acid;

13t-6βH-6(9α)-oxide-15S-hydroxy-15-ethyl-prostenoic acid;

13t-6βH-6(9α)-oxide-15S-hydroxy-15-ethynyl-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-methyl-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-ethyl-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-vinyl-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-ethynyl-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-phenyl-prostenoic acid;

13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-15,20-dimethyl-prostenoic acid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-methyl-prostenoic acid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-vinyl-prostenoic acid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-ethynyl-prostenoicacid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-ethyl-prostenoic acid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-15-phenyl-prostenoic acid;

13t-4-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-methyl-prostenoic acid;

13t-4-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-15,20-dimethyl-prostenoicacid;

13t-4-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-ethynyl-prostenoicacid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-methyl-prostenoic acid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-15,20-dimethyl-prostenoic acid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-phenyl-prostenoic acid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-ethynyl-prostenoic acid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-vinyl-prostenoic acid;

13t-5βH-5(9α)-oxide-11α,15S-dihydroxy-15-methyl-prostenoic acid,

and their 15R-hydroxy epimers.

Analogously, starting from the αH-(9α)-oxide-15-keto-compounds weobtained the corresponding αH-(9α)-oxide-15-substituted alcohols.

EXAMPLE 75

To a solution of 0.5 g of13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-14-bromo-16S-methyl-prostenoicacid-methyl ester-11-acetate in 2 ml of dimethylformamide,dimethyl-t-butyl silane chloride (0.21 g) and triethylamine (0.16 g) areadded. Keep shaking for 2 hours, then dilute with 4 volumes of water andextract with ethyl ether. The organic phase, after the usual washings,evaporation of the solvent, and filtration through silica gel withcyclohexane-ethyl ether 90:10 eluent, yields 0.57 g of13t-6βH-6(9α)-oxide-11α,15S-dihydroxy-14-bromo-16S-methyl-prostenoic /acid methyl ester-11-acetate-15-dimethyl-t.butylsilylether, from which,by transesterification in anhydrous methanol and 0.5 molar equivalentsof K₂ CO₃, the corresponding 11-hydroxy-derivative is yielded.

EXAMPLE 76

To 0.52 g of13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acidmethyl ester in 10 ml of dichloromethane, 2,3-dihydro-pyrane (0.27 g)and p-toluensulphonic acid (4 mg) are added. Keep at room temperaturefor 3 hours, then wash with a 5% solution of KHCO₃ and water to neutral,and evaporate to dryness. Filter through silica gel withcyclohexane-ethyl ether 90:10 as eluent, which yields 0.59 g of13t-5,14-dibromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prostenoic acidmethyl ester-11,15-bis-tetrahydropyranylether.

EXAMPLE 77

The 14-bromo-alcohols yielded by the foregoing examples, when treatedwith dimethyl-t.butylchlorosilane in dimethylformamide while, working tothe procedures as in example 75, or with an acetalic ether such as2,3-dihydropyrane-1,4-diox-2-ene, 1-ethoxy-ethylene, and working to theprocedure of example 76, are then converted into the correspondingsilyloxy or the corresponding acetalic ethers.

EXAMPLE 78

Under an atmosphere of inert gas, to a stirred solution of 0.46 g of13t-14-bromo-6βH-6(9α)-oxide-15S-methoxy-16S-methyl-prost-13-enoic acidmethyl ester in anhydrous dimethylsulfoxide (5 ml), potassiumtert-butylate (0.15 g) is added and the stirring is continued for 30minutes. The reaction mixture is diluted with 2 volumes of water andstirred for 15 minutes, then extracted with ethyl ether. The organicphases are re-extracted with 2×5 ml of 0.2 N NaOH and then with wateruntil neutral and evaporated to dryness to give 30 mg of6βH-6(9α)-oxide-15S-methoxy-16S-methyl-prost-13-ynoic acid methyl ester.The combined aqueous phase are acidified to pH 5.1 and extracted withethyl ether. After evaporation of the solvent, 0.28 g of6βH-6(9α)-oxide-15S-methoxy-16S-methyl-prost-13ynoic acid is obtained.

EXAMPLE 79

Under an atmosphere of inert gas, with stirring and rigorous exclusionof humidity, 0.84 g of trimethylsilylimidazole is added to an anhydrousdimethylsulfoxide solution of 0.445 g of13t-5αH-5(9α)-oxide-14-bromo-16R-methyl-prost-13-enoic acid. Stirring iscontinued for 30 minutes and then a solution of 0.19 g ofK-tert-butylate is added. After 30 minutes stirring, the mixture isdiluted with 3 volumes of water and stirred for 2 more hours. Afteracidification to pH 5.2, it is extracted with ethyl ether:hexane 80:20and the organic extracts are dried and evaporated to dryness to give0.31 g of 5αH-5(9α)-oxide-16R-methyl-prost-13-ynoic acid.

EXAMPLE 80

To a solution of sodium methylsulfinylcarbanion, obtained by heating at60° C. for 3 hours and 30 minutes a suspension of 50 mg of 80% NaH in 8ml of anhydrous dimethylsulfoxide, a solution of13t-6βH-6(9α)-oxide-11α,15S-dimethoxy-14-bromo-16(S,R)-fluoro-20-methyl-prost-13-enoicacid methyl ester (0.86 g) in 5 ml of dimethyl sulfoxide is added withstirring under an atmosphere of inert gas, at a temperature of 18°-20°C. After 40 minutes of stirring an excess of 25% NaH₂ PO₄ is poured inand the mixture extracted with ethyl ether to give 0.51 g of6βH-6(9α)-oxide-11α,15S-dimethoxy-16(S,R)-fluoro-20-methyl-prost-13-ynoicacid methyl ester.

EXAMPLE 81

To a solution of 80 mg of sodium amide in 10 ml of dimethylsulfoxide asolution of13t-14-bromo-5αH-5(9α)-oxide-11α,15S-dihydroxy-16-m-trifluoromethylphenoxy-17,18,19,20-tetranor-prost-13-enoicacid-11,15-bis-tetrahydropyranylether (0.65 g) in 5 ml ofdimethylsulfoxide is added. It is stirred for 2 hours and then dilutedwith water and extracted with ethyl ether. The ether extracts, afterreextraction with alkali are discarded. The aqueous alkaline extractsare acidified to pH 4.5 and extracted with ethyl ether to give 0.54 g of5αH-5(9α)-oxide-11α,15S-dihydroxy-16-m-trifluoromethylphenoxy-17,18,19,20-tetranor-prost-13-ynoicacid-11,15-bis-tetrahydropyranyl ether. A solution of this compound(0.23 g) in anhydrous ethanol (5 ml) and 2,2-diethoxypropane (3 ml) istreated with 20 mg of p-toluenesulfonic acid. After 5 hours at roomtemperature it is neutralized with aqueous NaHCO₃, evaporated undervacuum and the residue partitioned between water and ethyl ether. Theorganic phase is evaporated and after passing the residue through silicagel 0.1 g of5αH-5(9α)-oxide-11α,15S-dihydroxy-16-m-trifluoromethylphenoxy-17,18,19,20-tetranor-prost-13-ynoicacid ethyl ester is obtained. Deacetalization carried out on another 0.2g of product dissolved in 5 ml of acetone and treated with 3.5 ml of 0.2N oxalic acid for 8 hours at 40° C., after evaporation of the acetoneunder vacuum, extraction of the aqueous phase with ethyl ether andchromatography on silica gel with ethyl ether:ethyl acetate 95:5 thefree acid (95 mg) is obtained.

In the same way, starting from13t-14-chloro-6αH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-enoicacid-11,15-bis-dioxanylether the6αH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13-ynoicacid is obtained.

EXAMPLE 82

To a solution fo 0.48 g of13t-14-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-16-cyclohexyloxy-17,18,19,20-tetranor-prost-13-enoicacid methyl ester in 3 ml of anhydrous dimethylsulfoxide is added after30 minutes a solution of 1,5-diazabicyclo[5.4.0]undec-5-ene (0.25 g) in2 ml of anhydrous dimethylformamide and the reaction mixture maintainedfor 6 hours at 65° C. It is diluted with water acidified to pH 4.5,extracted with ethyl ether. From the organic phase, after evaporation ofthe solvent and purification on silica gel (eluted with benzene-ethylether 80:20),6βH-6(9α)-oxide-11α,15S-dihydroxy-16-cyclohexyloxy-17,18,19,20-tetranor-prost-13-ynoicacid methyl ester (0.29 g) is obtained.

EXAMPLE 83

Using one of the procedures described in examples 78 to 82 and startingfrom the corresponding 13t-14-halo-prost-13-enoic acids, the followingprost-13-ynoic acids are prepared:

6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15R-dihydroxy-prost-13-ynoic acid;

6βH-6(9α)-oxide-15-methoxy-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16S-methyl-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16S,20-dimethyl-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16R-methyl-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16S-fluoro-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16,16-difluoro-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-20-methyl-prost-13-ynoic acid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-17-cyclohexyl-18,19,20-trinor-prost-13ynoicacid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16-fluoro-17-cyclohexyl-18,19,20-trinor-prost-13-ynoicacid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-16-p-fluorophenoxy-17,18,19,20-tetranor-prost-13-ynoicacid;

6βH-6(9α)-oxide-11α,15S-dihydroxy-17-phenyl-18,19,20-trinor-prost-13-ynoicacid;

5βH-5(9α)-oxide-11α,15S-dihydroxy-16S-methyl-prost-13-ynoic acid;

5βH-5(9α)-oxide-11α,15S-dihydroxy-16S,20-dimethyl-prost-13-ynoic acid;

5βH-5(9α)-oxide-11α,15S-dihydroxy-16R-methyl-prost-13-ynoic acid;

5βH-5(9α)-oxide-11α,15S-dihydroxy-16S-fluoro-prost-13-ynoic acid;

5βH-5(9α)-oxide-11α,15S-dihydroxy-prost-13-ynoic acid;

5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-prost-13-ynoic acid.

Starting from αH-(9α)-oxide compounds and using the same procedure, theepimeric αH-(9α)-oxide-13-ynoic compounds are prepared.

EXAMPLE 84

A solution of 0.35 g of mercuric acetate in methanol is added at roomtemperature, with stirring, to a solution of 0.54 g of5c,13t-9α,11α,15S-trihydroxy-prostadienoic acid methylester-11,15-bis-THP-ether (PGF₂α -bis-THP-ether-methyl ester). Afterstirring for 15 minutes, 50 mg of sodium borohydride is added in smallportions, the elemental mercury generated is removed by filtration andthe methanol is evaporated under vacuum. The residue is partitionedbetween dichloromethane/water; the organic phase, after washing withsodium bicarbonate and water until neutral, is evaporated to give 0.51 gof crude 13t-11α,15S-dihydroxy-6 H-6(9α)-oxide-prostenoic acid methylester-11,15-bis-THP-ether. A solution of this in 10 ml of acetone addedto 8 ml of 0.2 N oxalic acid is heated to 40°-45° C. for 6 hours. Afterthe removal of the acetone under vacuum, the aqueous suspension isextracted with ethyl acetate (3×15 ml). The organic phase is washeduntil neutral and evaporated to dryness. The residue (approximately 0.45g) is adsorbed on silica gel (50 g) and eluted with ethyl ethercollecting fractions of 20 ml. From fractions 11 to 50,13t-11α,15S-dihydroxy-6αH-6(9α)-oxide-prostenoic acid methyl ester (0.11g; m.p. 67°-69° C.) is obtained. Then, after a mixture ofdiastereoisomers as 5-10% of ethyl acetate is added to ethyl ether,13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-prostenoic acid methyl ester (0.16g; [α]_(D) =+19.62° (CHCl₃)) is collected.

A sample of the later compound, after crystallization, shows m.p.40°-41° C., [α]_(D) =+25.2°, [α]₃₆₅° =+83.8° (CHCl₃). The crude freeacid has [α]_(D) =+18.3° (EtOH).

A sample is crystallized from pentane-ethyl ether affording purecrystalline 13t-6βH-6(9α)-oxide-11α,15S-dihydroxyprost-13-enoic acid,m.p. 80°-81° C., [α]_(D) =32.5°, [α]₃₆₅° =+111.6° (EtOH). The massspectrum of the compound shows the following peaks (m/e, intensity,structure):

336 7% [M-H₂ O]⁺, 318 3% [M-2H₂ O]⁺ ; 292 100% [M-H₂ O-44]⁺ ; 264 30%[M-H₂ O-CH₂ CHCO₂ H]⁺ ; 235 4% [M-H₂ O-(CH₂)₄ CO₂ H].

The mass spectrum of the 6αH-diastereoisomer is substantially similar.

EXAMPLE 85

A solution of 0.19 g of 5c,13t-9α,11α,15S-trihydroxy-15-methyl-PGF₂α-methyl ester in 2.5 ml of THF is added to 0.3 g of mercuric acetate in1.5 ml water/3.0 ml THF. After 30 minutes of stirring, 60 mg of sodiumborohydride in 1.2 ml of water is added to the deep yellow suspension.After the mercury is separated, the THF is removed under vacuum and theaqueous suspension is extracted repeatedly with ethyl acetate. Theorganic phase, when washed until neutral and evaporated to dryness,yields 0.16 g of product which is purified by thin layer chromatographyto give 0.04 g of13t-11α,15S-dihdyroxy-6αH-6(9α)-oxide-15-methyl-PGF.sub.2α -methylester, [α]_(D) =+6.2° (CHCl₃) and 0.034 g of the 6βH-6(9α)-oxide-isomer,[α]_(D) =+19.62° (CHCl₃).

EXAMPLE 86

0.43 g of 5c,13t-9α,15S-dihydroxy-16R-methyl-prostadienoic acid methylester-15-dioxanyl ether in methanol (2.5 ml) is reacted with a solutionof 0.38 g of mercuric bromide in methanol. The reaction mixture is heldat room temperature for 15 minutes and overnight at 0° C. Thecrystalline precipitate which forms is isolated by filtration to give0.36 g of 13t-15α-hydroxy-16R-methyl-6 H-6(9α)-oxide-5-bromomercuricprostenoic acid methyl ester, from which the mercury is removed upontreatment with sodium borohydride to give 0.12 g of13t-15S-hydroxy-16R-methyl-6 H-6(9α)-oxide-prostenoic acid methyl ester.Column chromatography on silica gel affects the separation into the6αH-6(9α)-oxide and 6βH-6(9α)-oxide diastereoisomers.

EXAMPLE 87

A solution of 0.55 g of 5c-9α,11α,15S-trihydroxy-prostenoic acid methylester in 2.5 ml of DME is added to a solution of 0.5 g of mercuricacetate in 2 ml of water/4 ml of DME. After 15 minutes, the reactionmixture is treated with a solution of 0.08 g of sodium borohydride in1.2 ml of water, the mercury is separated, the DME is removed undervacuum, and the residue is extracted several times with dichloromethane.The organic phase is evaporated to dryness, adsorbed on silica gel andeluted with ethyl ether/ethyl acetate to give 0.21 g of11α,15S-dihydroxy-6αH-6(9α)-oxide-prostenoic acid methyl ester and 0.18g of the 6βH-6(9α)-oxide isomer.

EXAMPLE 88

A solution of 116 mg of5c-9α,11α,15S-trihydroxy-17-cyclohexyl-20,19,18-trinor-prost-5-en-13-ynoicacid methyl ester-11,15-bis-THP-ether in 1.5 ml of methanol is treatedwith 64 mg of mercuric acetate in 1.5 ml of methanol. After 10 minutes,25 mg of sodium borohydride is added. Methanol is removed under vacuum,the mercury is separated and the product is dissolved in water/ethylacetate. Evaporation of the organic phase to dryness affords crude11α,15S-dihydroxy-6H-6(9α)-oxide-17-cyclohexyl-20,19,18-trinor-prost-13-ynoic acid methylester-11,15-bis-THP-ether (100 mg); this is treated in acetone (4 ml)with 2.5 ml of 0.2 N oxalic acid overnight at 40° C. After removal ofthe acetone under vacuum, the mixture is extracted with ethyl acetate.Evaporation of solvent gives a residue which is purified on silica gel(eluent, ethyl ether) to give 28 mg of11α,15S-dihydroxy-17-cyclohexyl-20,19,18-trinor-6αH-6(9α)-oxide-prost-13-ynoic acid methyl ester, [α]_(D) =+17.2°, [α]₃₆₅° =+54°, and 12.5 mgof the 6βH-6(9α)-oxide-isomer, [α]_(D) =+26.5°, [α]₃₆₅° =+84° (EtOH); M⁺406, M--H₂ O⁺ 388.

Under the same conditions,5c-9α,11α,15S-trihydroxy-16S-methyl-prost-5-en-13-ynoic acid methylester-11,15-bis-THP-ether gives11α,15S-dihydroxy-16S-methyl-6αH-6(9α)-oxide-prost-13-ynoic acid methylester and its 6βH-6(9α)-oxide isomer.

EXAMPLE 89

0.24 g of13t-11α,15S-dihydroxy-6αH,6(9α)-oxide-16-methyl-16-butoxy-20,19,18-trinor-prostenoicacid methyl ester and 0.13 g of the 6βH-6(9α)-oxide isomer are obtainedfrom the reaction of 1.01 molar equivalent of mercuric acetate (636 mg)in 10 ml of methanol and 1.1 g of 5c,13t-9α,11α,15S-trihydroxy-16methyl-16-butoxy-20,19,18-trinor-prostadienoic acidmethyl ester-11,15-bis-THP-ether in 5 ml of methanol. The mercurycompound so prepared is reduced in situ by the cautious addition of 85mg of sodium borohydride in small portions. The methanolic solution isthen decanted from the solid residue and reduced in volume. 10 ml of 0.2N aqueous oxalic acid and 20 ml of acetone are added, and the resultingmixture is held at 50° C. for 12 hours. The organic solvents are removedunder vacuum, and the resulting solution is saturated with sodiumsulfate and extracted with ethyl acetate. The organic phase is washedwith 30% ammonium sulfate (2×5 ml) and 2.5 ml of water; after dryingover NaSO₄, it is evaporated to give a crude residue which is purifiedon silica gel using an eluent containing an increasing fraction ofbenzene-methyl acetate, to give the isomeric 6αH-6(9α)-oxide and6βH-6(9α)-oxide. From the above reaction with16-m-chloro-phenoxy,16-p-fluoro-phenoxy, and16-m-trifluoromethyl-phenoxy-5c,13t-9α,11α,15S-trihydroxy-20,19,18,17-tetranor-prost-5,13-dienoicacid methyl ester-11,15-bis-THP-ether and the analogous17-phenyl-18,19,20-trinor-derivative were obtained respectively:

13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-17-phenyl-20,19,18-trinor-prostenoicacid methyl ester, [α]_(D) =+28°;

13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-6-m-chloro-phenoxy-20,19,18,17-tetranor-prostenoicacid methyl ester, [α]_(D) =+31°;

13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-16-p-fluoro-phenoxy-20,19,18,17-tetranor-prostenoicacid methyl ester, [α]_(D) =°30° C;

13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-16-m-trifluoromethyl-phenoxy-20,19,18,17-tetranor-prostenoicacid methyl ester, [α]_(D) =+33°;

and their 6αH-6(9α)-oxide isomers which show [α]_(D) ranging between +8°and 12° in CHCl₃.

EXAMPLE 90

Using the16S-fluoro-17-cyclohexyl-5c,13t-9α,11α,15S-trihydroxy-20,19,18-trinor-prosta-5,13-dienoicacid methyl ester-11,15-bis-THP-ether, in the procedure of example 89,the13t-11α,15S-dihydroxy-6αH-6(9α)-oxide-16S-fluoro-17-cyclohexyl-20,19,18-trinor-prost-13-enoicacid-methyl ester and its 6βH-6(9α)-oxide diastereoisomer are obtained.

EXAMPLE 91

0.12 g of 13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-prost-13-enoic acidmethyl ester in 6 ml of methanol is reacted with a 0.5 N aqueoussolution of lithium hydrate (2 ml). After six hours, the methanol isremoved under vacuum. The residue is diluted with water (2 ml) andextracted with ethyl ether to remove neutral impurities. The alkalineaqueous phase is acidified by treatment with 4 ml of 30% aqueous NaH₂PO₄ and extracted several times with ethyl ether. The later combinedether extracts are washed with water (2×1 ml) and dried; removal of thesolvent affords 91 mg of13t-11α,15S-dihydroxy-6βH-6(9α)-oxide-prost-13-enoic acid, m.p. 78°-80°C., [α]_(D) =+31° (EtOH). This procedure is used for saponification ofthe esters from the preceding examples to the corresponding free acids.

EXAMPLE 92

11α,15S-dihydroxy-6βH-6(9α)-oxide-16S-methyl-prost-13-ynoic acid (0.11g) in methylene chloride is treated with 1.5 molar equivalent ofdiazomethane in methylene chloride. After 15 minutes, solvent is removedunder vacuum and the residue adsorbed on silica gel. Elution with ethylether/benzene (70:30) gives, in the following order, 12 mg of11α-hydroxy-15S-methoxy-6βH-6(9α)-oxide-16S-methyl-prost-13-ynoic acidmethyl ester and 78 mg of11α,15S-dihydroxy-6βH-6(9α)-oxide-16S-methyl-prost-13-ynoic acid methylester. Using in this procedure diazoethane in side of the diazomethane,11α-hydroxy-15S-ethoxy-6βH-6(9α)-oxide-16S-methyl-prost-13-ynoic acidethyl ester is obtained.

EXAMPLE 93

A solution of L₂ (0.33 g) in methylene chloride is added to a suspensionof finely divided calcium carbonate in 6 ml of methylene chloridecontaining 0.54 g of 5c,13t-9α,11α,15S-trihydroxy-prostadienoic acidmethyl ester-11,15-bis-tetrahydropyranyl ether (PGF₂α-bis-tetrahydropyranyl ether methyl ester). The reaction mixture iscooled in an ice/water bath and kept in darkness. After three hours ofstirring, inorganic compounds are removed by filtration and the organicphase is washed with 0.25 N sodium thiosulfate and water. Removal of thesolvent affords 0.66 g of crude 13t-5-iodo-6H-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoic acid methylester-11,15-bis-tetrahydropyranyl ether. A solution of this in 10 ml ofacetone is added to 8 ml of 0.1 N oxalic acid and heated to 45°-46° C.for 4 hours. The acetone is then removed at reduced pressure and theaqueous suspension is extracted with ethyl acetate (3×12 ml); theorganic phase is washed until neutral and evaporated to dryness. Theresidue (0.42 g) is separated on silica gel with ethyl ether eluent.Elution of the high R_(f) fraction with acetone gives 0.14 g of13t-5-iodo-6αH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoic acid methylester, while the low R_(f) portion is 0.20 g of13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoic acid methylester.

The methyl ester of the following acids were prepared analogously:

13t-16S-methyl-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid;

13t-20-methyl-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid, [α]_(D) =+23°, [α]₃₆₅° =+78° (CHCl₃);

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-cyclohexyl-prost-13-enoicacid;

13t-5-iodo-6αH-(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-cyclohexyl-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-phenoxy-prost-13-enoicacid;

13t-5-iodo-6αH-6(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-phenoxy-prost-13-enoicacid;

13t-5-iodo-6βH-6(9α)-oxide-15S-hydroxy-prost-13-enoic acid;

13t-5-iodo-6αH-6(9α)-oxide-15S-hydroxy-prost-13-enoic acid;

13t-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-ynoic acid;

13t-5-iodo-6αH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-ynoic acid;

5-iodo-6βH-6(9α)-oxide-16S-methyl-11α,15S-dihydroxy-prost-13-ynoic acid;

5-iodo-6βH-6(9α)-oxide-20-methyl-11α,15S-dihydroxy-prost-13-ynoic acid,[α]_(D) =+20° (CHCl₃).

EXAMPLE 94

To a solution of 0.22 g of 5c,13t-9α,11α,15S-trihydroxy-15-methyl-PGF₂α-methyl ester in 10 ml of CH₂ Cl₂ and 0.1 ml of pyridine is addeddropwise a solution of 180 mg of iodine in methylene chloride. Theresulting mixture is stirred for 1 hour. After dilution with water andwashing of the organic phase with 0.1 N sodium thiosulfate and wateruntil neutral, the solution is evaporated in vacuum to a small volumeand adsorbed on a silica gel plate 0.5 mm in thickness. Afterdevelopment with ethyl ether and elution with acetone, 0.052 g of13t-15-methyl-5-iodo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid methyl ester and 0.021 g of the isomeric 5-iodo-6αH-6(9α)-oxide areobtained.

EXAMPLE 95

0.288 g of 5c-16,16-dimethyl-9α,11α,15S-trihydroxy-prost-5-enoic acidmethyl ester in a solution of 60 mg of pyridine in methylene chloride (8ml) is reacted with 115 ml of bromine in methylene chloride. After 30minutes, starting material has completely disappeared; the organic phaseis washed with water, then 5% aqueous metabisulfite, and then wateruntil neutral to give, after removal of the solvent and purification byTLC on silica gel with ethyl ether as eluent, 0.083 g of16,16-dimethyl-5-bromo-6βH-6(9α)-oxide-prostanoic acid methyl ester and0.04 g of 6αH-diastereoisomer.

The following compounds were prepared analogously:

13t-16,16-dimethyl-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid;

13t-16,16-dimethyl-5-bromo-6αH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid.

EXAMPLE 96

To a solution of hydrotribromide pyrrolidone (1.1 molar equivalents) inanhydrous tetrahydrofuran (6 ml) is added a solution of5c,13t-9α,11α,15S-trihydroxy-18,19,20-trinor-17-cyclohexyl-prost-5,13-dienoicacid methyl ester-11,15-bis-tetrahydropyranyl ether (0.7 g) in 6 ml oftetrahydrofuran. The mixture is stirred for 12 hours, the precipitatewhich forms is removed by filtration, and the tetrahydrofuran solutionis diluted with 2 volumes of acetone and treated with 4 g of potassiumiodide. After 4 hours at room temperature, the iodine liberated isdecomposed with sodium metabisulfate. 1.5 volumes of 0.1 N aqueousoxalic acid is then added and the mixture heated to 48° C. for 4 hours.The mixture is reduced under vacuum and extracted with ethyl acetate.Separation on TLC gives 0.14 g of13t-5-bromo-6αH-6(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-cyclohexyl-prost-13-enoicacid methyl ester and 0.11 g of the 5-bromo-6βH- 6(9α)-oxide.

Using the procedures of the examples 95 and 96, the following6(9α)-oxides were obtained:

5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-cyclohexyl-prost-13-ynoicacid methyl ester;

5-bromo:6βH-6(9α)-oxide-11α,15S-dihydroxy-prostanoic acid;13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoic acid;

13t-20-methyl-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid;

13t-15-methyl-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid;

13t-15-methyl-5-bromo-6αH-6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid;

13t-16S-methyl-5-bromo-6βH6(9α)-oxide-11α,15S-dihydroxy-prost-13-enoicacid;

13t-5-bromo:6βH-6(9α)-oxide-11α,15S-dihydroxy-18,19,20-trinor-17-cyclohexyl-prost-13-enoicacid;

13t-5-bromo-6βH-6(9α)-oxide-11α,15S-dihydroxy-17,18,19,20-tetranor-16-m-trifluoromethyl-phenoxy-prost-13-enoicacid.

EXAMPLE 97

A solution of 0.1×10⁻³ M of a methyl ester, prepared according toexamples 93 to 96 in 2 ml of methanol is treated with 1 ml of an aqueoussolution of lithium hydrate (0.2×10⁻³ moles). The mixture is stirred for3 hours, evaporated nearly to dryness, diluted with 5 ml of water, andextracted with ethyl ether.

The organic phase is washed with 0.1 N LiOH (2 N) and water, and is thendiscarded. The aqueous phase is acidified to pH 4.8 with 30% aqueousNaH₂ PO₄ and extracted with ethyl ether to give the free acid.

We claim:
 1. A compound of the formula (I) ##STR54## where q is 2;R is afree carboxy group or an esterified carboxy group of the formula--COOR_(c) wherein R_(c) is C₁ -C₁₂ alkyl or C₂ -C₁₂ alkenyl; Z₁ ishydrogen; p is zero or an integer of 1 to 7; R₁ is hydrogen, hydroxy, C₁-C₆ alkoxy, benzyloxy, C₂ -C₁₂ alkanoyloxy, or benzoyloxy; Y is##STR55## wherein Z₂ is halogen; one of R₂ and R₅ is hydrogen, C₁ -C₆alkyl, C₂ -C₆ alkenyl, C₂ -C₆ alkynyl, phenyl, α-naphthyl or β-naphthyland the other is hydroxy, C₁ -C₆ alkoxy, benzyloxy or R₂ and R₅, takentogether, form an oxo group; each of R₃ and R₄, which are the same ordifferent, may be hydrogen, C₁ -C₆ alkyl or fluorine; each of n₁ and n₂,which are the same or different, is zero or an integer of 1 to 6; X is--(CH₂)_(m) --, wherein m is zero or 1; R₆ is:(a') hydrogen; or (b') C₁-C₄ alkyl; and the pharmaceutically or veterinarily acceptable saltsthereof.
 2. A compound selected from the group consistingof:13t-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-16S-methyl-prost-13-enoicacid methyl ester;13t-5βH-5(9α)-oxide-11α-hydroxy-14-bromo-15-oxo-20-methyl-prost-13-enoicacid methyl ester;13t-5βH-5(9α)-oxide-16S-methyl-11β,15S-dihydroxy-14-bromo-prost-13-enoicacid;13t-5βH-5(9α)-oxide-16R-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid;13t-5βH-5(9α)-oxide-20-methyl-11α15S-dihydroxy-14-bromo-prost-13-enoicacid13t-5βH-5(9α)-oxide-16(S,R)-20-methyl-11α,15S-dihydroxy-14-bromo-prost-13-enoicacid; 13t-14-bromo-5βH-5(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acidmethyl ester;13t-14-chloro-5βH-5(9α)-oxide-11α,15S-dihydroxy-13-prostenoic acidmethyl ester;13t-14-bromo5βH-5(9α)-oxide-11α,15S-dihydroxy-20-methyl-13-prostenoicacid methyl ester;13t-52H-5(9α)-oxide-14-bromo-16R-methyl-prost-13-enoic acid;and thepharmaceutically or veterinarily acceptable salts thereof.
 3. Ahypotensive composition comprising a pharmaceutically effective amountof a compound as claimed in any one of claims 2 or 1 and apharmaceutically or veterinarily acceptable carrier and/or diluent.
 4. Avasodilatory composition comprising a pharmaceutically effective amountof a compound as claimed in claim 2 or 1 and a pharmaceutically orveterinarily acceptable carrier and/or diluent.
 5. A blood plateletanti-aggregation composition comprising a pharmaceutically effectiveamount of a compound as claimed in claim 2 or 1 and a pharmaceuticallyor veterinarily acceptable carrier and/or diluent.
 6. An anti-thromboticcomposition comprising a pharmaceutically effective amount of a compoundas claimed in claim 2 or 1 and a pharmaceutically or veterinarilyacceptable carrier and/or diluent.
 7. A uterus stimulating compositioncomprising a pharmaceutically effective amount of a compound as claimedin claim 2 or 1 and a pharmaceutically or veterinarily acceptablecarrier and/or diluent.
 8. A lutealytic composition comprising apharmaceutically effective amount of a compound as claimed in claim 2 or1 and a pharmaceutically or veterinarily acceptable carrier and/ordiluent.
 9. A cytoprotective composition comprising a pharmaceuticallyeffective amount of a compound as claimed in claim 2 or 1 and apharmaceutically or veterinarily acceptable carrier and/or diluent. 10.An anti-secretory composition comprising a pharmaceutically effectiveamount of a compound as claimed in claim 2 or 1 and a pharmaceuticallyor veterinarily acceptable carrier and/or diluent.
 11. A bronchodilatorycomposition comprising a pharmaceutically effective amount of a compoundas claimed in claim 2 or 1 and a pharmaceutically or veterinarilyacceptable carrier and/or diluent.
 12. An anti-asthmatic compositioncomprising a pharmaceutically effective amount of a compound as claimedin claim 2 or 1 and a pharmaceutically or veterinarily acceptablecarrier and/or diluent.